Shop Wiring

Will be going all tin on the interior with roll insulation in the walls and blow-in insulation in the ceiling.

Once I get it done I really don't want a spiderweb of electrical conduit running all over the interior, so I plan to do the wiring before I put up the interior tin and have flush-mounted outlets, switches, etc.

A guy who works for us that used to be a professional electritian is gonna do the work and he said it'd be ok to run the insulated cable inside the walls and ceilings as long as it's well supported out of the way of where any screws etc. might hit it.

Will that work or should the wiring still be run in metal conduit? This is in a very rural agricultral area so I'm not worried about any inspectors, codes, etc. but I want it to be safe and functional and trouble-free for the life of the building. Dont want to have to tear the walls down and redo the whole thing two years down the road.

One final thought- will mice chew the insulated cable?

I understand the price difference would most likely be worth it as far as quality of the finished job goes.

But the problem is I already have all the Romex here and I'm 6 hours round trip from the store I bought it at. Might be cheaper to just pick up some regular conduit locally and run my Romex in it?