Regarding just the floor boards (although I'd listen to Steve on the
metal stuff), it is easy to T&G yourself. Go buy a 3/4hp router and the
2 appropriate router bits. The whole mess will cost you less than $300
if you shop around. Oak is hard, so you will need to make several
passes to make a good job, but T&G is a pretty straight forward process.
If you try to remove too much wood in one pass, you will know it, as
your router will sound like it is dying, and you will be pushing too
hard to feed the wood through.

Some of it can even be done on a table saw (works great for the rough
cuts to remove the shoulders)





CS wrote:
My pine floor is 22mm T&G attached to steel beams with Wurth Zebra
Pias screws. Pilot hole in board and self tap into 6mm steel with
ease - up to 10mm with care!! There is a foam/foil insulation layer
under the pine. Getting boards T&G would probably be expensive - I
would be tempted just to put in some biscuit joints at say 300mm
intervals.

http://www.luxe-motor-kei.co.uk/inte...e/image35.html
http://www.luxe-motor-kei.co.uk/inte...e/image37.html