GRANBY, Colo. -- 7NEWS has an exclusive look inside the rented Granby work shed where Marvin Heemeyer retrofitted his machine of destruction -- the large bulldozer that tore down large sections of buildings in the town Friday.

The large metal work shed is located next to Heemeyer's former muffler shop in Granby.

On Tuesday, 7NEWS was allowed inside, and found a home-built crane, a cement mixer, empty sacks of concrete, and welding equipment. Also inside were a makeshift sleeping area with a cot, blanket and refrigerator (pictured, right). Heeymeyer's lease on the shed expired on May 31.

"I would suspect if he was working all night, trying to get this done on a deadline cause he needed to be out by the end of May, that he probably, maybe would work at night when we're not here and sleep during the day," said Travis Busse, the building owner.

Busse said he never saw Heemeyer come or go, but that may be because Heemeyer rented a van instead of using his personal car. The van is still inside the shed.

The Grand County sheriff told 7NEWS that he thinks Heemeyer might have been working on turning his bulldozer into a tank for as long as a year, all without raising suspicion in the small town.

"It's a little eerie, knowing that we were this close and knew nothing," said Busse, who had no idea what was going on inside the rented shed.

Residents of Granby fear it will cost millions of dollars to rebuild the mountain town of 2,200 people after a man who lost two fights with city officials used an armored bulldozer to damage more than a dozen buildings.

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An Exclusive Look Inside Heemeyer's Work Shed Local Resident Describes Granby Damage Family Targeted By Bulldozer Picks Up The Pieces See Extensive Damage From Rampage

Heavy machinery rumbled through the streets of Granby again on Monday, this time to clean up the damage left by Heemeyer's rampage Friday.

Mayor Edward "Ted" Wang said 13 buildings were damaged and at least six, including the town hall, were expected to be total losses.

Authorities found lists in Heemeyer's home that included people who sided against him in his disputes and named 14 buildings, the Rocky Mountain News and The Denver Post reported in Tuesday editions. Grand County Sheriff Rodney Johnson said the lists were not labeled as enemies or targets.

The lists included the mayor, the county manager, several business owners, the 13 buildings Heemeyer hit and the Catholic church, which was not damaged. The Rev. Frank Gerber told the News that Heemeyer did not attend the church and had no grudge against it that Gerber knew of.

Townspeople worked with shovels on Monday while front-end loaders filled dump trucks with rubble.

"We're getting help from every direction," Grand County emergency management director Jim Holahan said.

Heemeyer, 52, had battled with town officials over zoning rules and town code violations at his muffler business. Neighbors and acquaintances said he was furious but hadn't talked about his battle with the town for a while.

Investigators believe Heemeyer spent months building a steel and concrete box around the driver's cage of the bulldozer and targeting buildings that had some association with the disputes.

He shot himself in the head shortly after the machine ground to a halt Friday in the wreckage of a warehouse behind Gamble's Hardware Store (pictured, right), said Grand County Coroner Dave Schoenfeld.

A service was held in a park near the wrecked town hall on Monday night. A counseling center was to remain open through Tuesday.

Michael Beasley, executive director of Gov. Bill Owens Department of Local Affairs, said state money would be available to rebuild town hall, repair roads scarred by the 25-ton behemoth and make other public works repairs not covered by insurance.

Healing and rebuilding were already under way.

Joan Parsons was planting flowers in front of her motel on Agate Avenue Friday when police ordered her to evacuate. Heemeyer knocked down two trees just feet from her plantings, but on Monday the flowers were taking root.

"As long as nobody was hurt and it's all over, we're OK," she said.

Sheriff's deputies planned to interview several of Heemeyer's acquaintances and friends to determine how and when he armored the bulldozer, Undersheriff Glen Trainor said.

Investigators believe he did the work himself, using a crane he had built or modified.

"We're obviously going to keep our eyes open, but we have no info to indicate that he did this with anybody else," Trainor said.

The bulldozer's hydraulic lines and radiator were covered with steel plating, TV cameras connected to three monitors showed Heemeyer where he was going.

The machine came to a halt after its radiator began leaking and it apparently dropped through a floor in a warehouse.

Police had fired hundreds of rounds of bullets at the bulldozer and tried three times to blast through it, but nothing could penetrate the armor. Eventually they were able to remove an air conditioner and get inside through the opening.

It took a crane to remove Heemeyer's body.

Investigators discovered .50-caliber rifle, two military-style assault rifles and a handgun inside.

The bulldozer, sitting near busy U.S. 40 Monday, caused a traffic jam over the weekend when passers-by stopped to examine it. Officials covered it with a tarp to discourage spectators. It was later moved to an undisclosed location in nearby Fraser, where the Colorado Bureau of Investigation examined it.

There is no word on what might become of the bulldozer, once the investigation is completed.