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On Friday, April 12, 2019 at 9:33:41 AM UTC-4, Davej wrote:
This video makes it look easy...

https://www.youtube.com/watch?v=1xG7xFIGecQ

...but realistically what would go wrong?

My husband and I built a garage in 2006. We hired the concrete and
roofing. A buddy came over and helped raise the roof trusses.

It was a lot of work, but nothing was very complicated.

A lot could go wrong, but my husband's a mechanical genius, so
nothing did.

I designed and built my entire quite fancy quite large passive solar house.
I did it with concrete blocks, not timber framed and its got a flat metal
decking roof and uses galvanised sheet metal inverted J beams with
variable height timber rafters bolted to the inverted J beams.

Quite a bit of work but very doable by anyone with any real
mechanical ability.