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It's been done on here before:
https://www.lfgss.com/conversations/351814/ -
(Edit- did not look at time stamp when I wrote this reply, probably moot now!)
Not at all.
I’d you don’t need the big door there’s no reason not to. Just make sure you put some kind of membrane/dpm between the door and whatever you build as you don’t want condensation (which you may well get on the back of the door in winter, especially once you cover it and remove any ventilation) on the back of your stud wall. Plus it’s just a stud wall, if you decide you want the roller door back you can take it down.
The one thing I came here to say was insulate it! But sounds like you’re doing that. Obviously walls/ceiling is most important but you could do a floating floor very easily. Even 25mm PIR board with T&G floorboards on would make a hell of a difference.
Asbestos work is coming on nicely. Revealing some decent wood battening behind the boards which is going to make insulation and plasterboard easier.
The big issue for me is the garage roller door. It presents a number of problems that need sorting. Insulation, security, humidity, sound proofing and probably more I've not thought of. It will cost too much to remove and brick up. So I'm considering leaving it in place and building a stud wall with a door behind it.
Am I being a moron?