I've also been thinking about making the leap to glass on wood longbows and I'm eyeballing the Binghams hybrid R/D longbow kit. I think I need to buy the whole ball of wax for my first one, then once I get that under my belt I'll know how to order the glass and lams for the next, and the next, and............well you know.
I'm alot like Woodsy Dave, I've got a bunch of selfbows under my belt, a handfull of bamboo backed osage bows but never made one with glass over it. I've been ready to take the next step for quite some time now but just can't seem to pull the trigger. At a little over $300 bucks it's kind of hard to take that leap of faith, but I know that I'll more than get my money's worth out of the form, hose, and other hardware plus the experience. Who knows, I may just take a few guys up on their offers to buy a bow from me when I feel confident with my work? I wish I had $100 bucks everytime somebody asked me to build them a bow.