I did some experiments today with strand pressed bamboo plank, since I want to use that for a new project (window shutters) and see how it machines. I have used a lot of bamboo plywood with very good success but never tried this variety which is made from shredded bamboo strands compressed with phenolic resin. These boards are solid "wood" and intended to be used for flooring, have very durable finish, are extremely dense and hard (Janka>4000) and reasonably cheap ($129 for 27 Sqft) for 5.375" wide boards, somewhat less than 5/8" thick with T&G.
Turns out, it machines nicely and holds even very small details. While the end mill left a few fuzzies, they went off with a rotary abrasive buff right away. My test board in the pictures is 7x5 inches and the smallest characters are 1/8" tall.
I had only samples of the marbled variety but it can be had evenly straw yellow, amber or dark brown as well.
I guess I will order a few boards more than I need for my project to use for small signs or relief carvings, boxes etc. in the future.
FWIW, this is not the original finish they come with (I had planed that off) but new lacquer.