Jamo D830 In Walls: What to do?

I recently purchased a pair of Jamo D830 In Wall speakers with the idea of putting them in a cabinet and end up with a pair of nice speakers for the money. I didn't realize that the cabinet had to be an exact size and that drivers, enclosures and the crossover are all tuned for each other, and if this really is the case, wheredo designers start? At the drivers?

I figure I'll contact Seas and see if they can give me the specs for the cabinet size and go from there.

Does anyone have any advice on how I can get these babies singing at thier full potential?

I picked them up because they use Seas Excel midbass drivers and Seas Excel tweeters, and the front baffle on the In Walls looks identical to the D830 Bookshel speakers, and I assumed (I know, I know) that they used the same crossover (which I'm not sure about now).

Do you think I could get away with some .75 or 1.0 cubic foot enclosures from Dayton audio, cut out a hole in the baffle and then mount the in wall baffle to that? Should I look into having higher quality crossovers built by Madisound? Should I just sell them and cut my loses?