I have had some experience with that seller. He seems very nice but there have been times I talked to him about his design on something or other and did not get the answer I needed, each time it has been about his design.
The other thing is that his designs on various things are very new for him and he has had to change them due to problems that he did not foresee and I don't see this thing being any different.
I would wait and see if it becomes new and improved.
Again, I think this seller is on the up and up and is very nice, but I just don't know about this design yet, the concept may change.
I don't think this drawer is necessary and I don't see how bees would not be killed each time the drawer is pulled out and possibly back in as well.
I agree with the initial thoughts from everyone on this, but I understand those who use deeps not wanting to do all that lifting.
The only thing I want to say about the odd size thing, I bought equipment from one dealer and then I bought equipment from another and the other dealer makes their wooden ware thicker than everyone else, I knew that from their website but I didn't think it was a big deal but when I got the supers I did have a little trouble matching them up perfectly. It was just a matter of having to keep moving it around a bunch of times to get it to line up with the others(its not a perfect match but close enough) I already had but still not something I would want to deal with if it was on the bottom and I was holding a heavy deep super and trying to make it fit.
I am not sure if the inside would match up that perfect, I would ask alot of questions.
It sounds like maybe you are considering making one yourself? That may be your best bet if you really want one, that way you know its going to fit perfectly and it will be alot cheaper.