Laying conduit in preparation for electrical work? UK
Call around to local electricians to see if doing this would cause any problem. Since they don't know your skills, they will likely recommend not doing it, but you never know.

Some of it might be acceptable, while some others would be too risky.

I don't know about the codes where you live, but I believe I've read that in some places the walls and wiring would need to be exposed in order to have an inspector look at them. Since this is just a garage, not sure if you're going the whole "permit" route.

I understand your desire to get things done while you're off work, but don't rush into something that'll cost you more in the long run.