Depends how crazy you want to go and what you want to end up with.
I built 4 x 8 panels with holes cut 30' x 30" for the lids. Then framed the hole and the entire panel with 2x4. These I will take out and stack at home each year. The panels go across the pit and allow for a pit that is 4-6 1'2 feet wide and gives plenty of overlap.
4 guys= 4 or 5 lids.
I like to frame out the front of the pit wall with plywood. I start with a 2x4 about 6 inches down from the plywood and then run 2x4 x4 feet down from there. This allows for legs to extend below the plywood and allows the plywood to be make level in the pit by digging holes where the 2x4 legs contact the bottom of the pit. down from there. Al also run a cross piece of 2x4 between each vertical 2x4 to create another shelf. Measure your thermos etc for the height you want.
I line the sides and back with plastic top to bottom and the front about 2 feet down before placing plywood. This helps keep the dust down and also dirt from falling all over your stuff while hunting.
Then I place straw in the bottom of the pit to keep the mud and snow from becoming too much of a mess.
Total for me with a 6 man pit.
6 lids framed = 6 4x8 x 3/4 ply plus 2x4's
Wall 3 sheets of 4x9 ply 3/8" thick, I can't remember the amount of 2x4 but figure at least 20.
3 inch screws used.
all walls and lids can be re-used year to year,
Straw and plastic will be consumables.
will try and throw some pics up later
There was about 30 MPH wind while doing this so the plastic is billowing into the pit
This is the only pic that shows what I was trying to say about the "legs". We had to cut them on the short end of the pit.
ready for backfill
Looks narrower than it is, It is 4 feet in width, though 5 foot would be ideal. Still some tuning to do on the walls etc
From outside. I use different lids when hunting and stack these in the truck
ready to hunt
- 15 heaters are nice !