Need to have a loft bed frame built

It looks like my wife and I are moving into a very small one bedroom flat. The one bedroom is exceptionally small, too. So the best option I can think of is to get some sort of 'loft bed' made so we can have our bed off the floor and use the space underneath for storage (the flat has pretty high ceilings).

IKEA and others sell these sorts of things, but they're just too small for me. Any ideas where I can get something like this built?

I just would actually need a raised platform that I can put a mattress on, not a fully-built bed frame. It seems like the construction should be simple enough (I knew a few guys who made similar things in Uni), but I have a) no skill and b) no place to try to build something like this.

I made the one where I live at the moment, same deal, small flat, no space.

Making it was pretty straightforward, if you have the time you can learn as you go along.