Wood – How to you cut a solid bamboo wood plank

Interesting design. f I'm understanding it correctly I think it could work, but I would definitely use screws to secure your slide-in shelving and all the other joints. Pocket hole screws can be used if you are concerned about aesthetics. The weakest aspect is probably that it will be a little tippy sideways, depending on how you load it. A horizontal support along the back (similar to how you have it in the front) would help that... it could be shorter in length than the front one, to help change up the look.

Does the old blade have a diamond shaped hole? My 77 is a few miles away, but my recollection is that it uses that configuration. Some new blades won't have it at all (and thus are not suitable), others will have a round hole and a pre-cut diamond hole that punches out to engage the diamond shape on the saw clamps.

Here's the manual, which suggests both the "left hand thread" and diamond arbor as correct recollections on my part:

http://mdm.boschwebservices.com/files/SHD77M-02-73%20Manual%20r113863v5.pdf

Here is a blade which appears to have the diamond hole possiblity, but not yet knocked-out.

Here is one with the hole cleared to the diamond shape:

Note that the worm drive saw, while you prefer the feel/heft of it, can be rather more dangerous than a direct drive saw if it's jammed and kicks back. Most people treat them with a healthy dose of respect - or learn to eventually.