Richard,
The difference in the 3 primary bamboo models goes a little farther than just the number of lams. The Tembo has 3 lams with 2 lams on the back of the riser, and the 3rd lam or belly lam is designed to come up over the fades onto the belly of the riser.
The Big 5 has 4 lams of bamboo all on the back side of the riser. That is why most Big 5 models you see have black or brown glass to cover the fades without any bamboo there.
The Wesley is more like the Tembo design with 4 lams on the back of the riser and 1 lam over the fades on the belly.
There are of course variations to this by custom order, but that is the way those 3 are designed.
The Redman is all yew, 3 on the back side and 1 on the belly.
The Halfbreed, Cheetah, and Owl are a combo of yew, juniper or osage outer lams, then 2 lams of bamboo, then a final lam of yew, juniper, or osage on the belly of the riser. Most of the models with bamboo cores mirror this design. He makes an all osage limbed bow that is typically like the Redman, except with osage orange.
That's about it. You can of course custom order in many different wood combos. Carbon can be added as well as actionboo cores etc.
Craig will build them straight, backset up to an 1" or string follow up to an 1". He will also make a forward riser variation on request.
Each of these bows have unique characteristics.
Tim