I've lined my concrete sectional garage with sterling board attached via batons to the walls and painted it all white with 7mm recycled plastic floor tiles for "warmth" and drop / break protection and to reduce the awful amount of dust that concrete bases create.
Timber all the way and once the base is down you can build it yourself
![Smilie](http://www.ukmonster.co.uk/monster/images/smilies/smile.gif)