Some paring knife slots and a scissors slot in the base works for me. Forty slots up top would be far too many for me (at least, for now!).
I think I could cut back to 40. :)
Why don't we go with a more modest 25 slots, so that I could buy one and the rest of you could just buy two. ;)
Oh, and I would like a slot for a cleaver. As long as we are putting the prototype wishlist together.
I like the idea of a modular system. The block could be built up in layers within a universal frame, with each layer of a standard spec encompassing the primary knife sizes. The idea would be to grow the block as your knife inventory grew. The sides could have a big dovetail (or something) in them so that you could add modules to accomodate paring or other small blades and common utensils.
TK, it is walnut.
Sorry David (if you're reading this) that those of us without one of your blocks aren't ready to accept that you are done making them. ;)
Although I don't own it, this is one of my favorite blocks. No idea who made it.