It should look good painted Tony. My old white painted wall added so mich light to my work area.
Reflecting light into the work area is the job of the corrugated iron in my setup. I was surprised at how much brighter it was after putting it up. Especially noticeable at night with the fluro lights on.
I should have got them to put foil insulation on the sides of the shed. I asked the contractors about it but they were't keen to do it. I guess they reckoned it was a pain to do. I'm told that you shouldn't run batts against the colorbond without foil as the condensation can get into the batts. The chipboard flooring will have to be enough.
The latest update to the shed is a green one. I got a 3KW Solar grid feed inverter setup installed. It's on the North-West side of the shed so it misses out on some morning sun but it was pumping out 2.9KW yesterday afternoon on a partly cloudy day. A couple of neighbors have solar systems on their sheds with the panels tilted up on frames to catch more sun but it looks butt ugly in my opinion. You don't notice these unless you are standing in the right spot.
Cheers