Quote:
Originally Posted by Feralvr 
Excellent option too!! I like it! I am just worried about the persistance of the raccoon and possums during the winter month with the insulation material. They trashed my insulated door a few times and I had to replace it. But maybe the two inch insulation would be an excellent option here and the polyurethane foam is brilliant. I didn't think of that and used silicone. I made my shelter inside my house and let it all dry. It was quite sturdy for the whole winter except for the door problem  . I am hoping the Feral Villa will keep the raccoons out.
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If one would build frame from wood to make attachment rails for sheetmetal roof panels, then it would be really strong against raccoons too, there are always left overs if someone is building a shed or roof with those profile metal sheets, which are often free as they are waste that builder need to pay to dispose or at very minimum value of such leftover is minimal in metal recycling too.
I have few leftovers of Rannila brand roof metal sheets (it has paint/coating on two sides, so no rusting, but as shelter was under the roof there was no need to use those.
However shipping them would kill the zero price

For hole one would of course need non profile type of metal sheet, also edges of hole need to be covered with rubber strip, any kind of store that sells for industry should have those.
Cutting metal is of course bit of a job, but I would guess any car repairshop should have at least one person who would be willing to cut it after a day, at least here garage owners really appreciate any kind of business, cost is small and for them trouble is little.
I don't have very good building skills, I can make things work somehow, but I can't make them look too good, but cat's seem not to really care, for them function seem to be more important than looks.
Here if I put shelter outside, I have to calculate bit of additional strength as we can have quite bit of snow during winter, so any structure outside should be able to handle weight of snow ever theoretically coming down + safety margin.