Ouch Shag those Kellers are expensive. Why don't you try making the shells with staves, which I think is better acoustically and mechanically than the ply construction Keller uses. Lets try a snare as an experiment and see if it turns out. I probably have enough ambrosia maple lying around to do one like this:
PDGood Snare Samples
I'll make the staves for ya and you can take it from there. I have regular hard maple also. Your choice. I would need the depth and diameter. If you don't have access to a lath pm me I have an idea!
Michael