Doug,

I would suggest you check out this site as well.
Lots of great ideas for custom fitting, and outfitting your cockpit.

You might also check out Joe Greely's custom seats, by looking at them I'd say you wouldn't have a problem with your legs going to sleep, but they may be so darn comfortable 'you' might have trouble staying awake, seriously the people who have Joe's seats give them glowing reviews.

Good luck getting rid of the numbum.

Ken