Looking nice! I look forward to seeing the lids
I'm pretty new to the scene and my wife really fancies the look of wenge, is it always that brittle? Would a bandsaw splinter it as badly? I specialise in small jobs like that almost completely, isn't it a great feeling when you can "unblock" a job that's gone wrong and put it right like that?
With the sandpaper / glass trim up sheet, you're singing from the same song-sheet that I do with all my small jobs. I can't recall where I read about it, or heard of it, or if I just made it up for a job, but what I do, is to take abrasive sheet from a roll and super-glue it to waste MDF sheets. Some flat, for finishing exactly like your glass one, and others trimmed to the width of the paper, with it wrapped around 3 sides of the MDF piece. Those make a nice mobile version with 3 edges that will rub harmlessly over the wood, and one that will cut in, plus the two flat sides to flatten & finish. Ideal sanding blocks for inside corners and small stuff.
I know, if I was better with a plane, and owned a collection of small and specialised ones, they'd do a better job in most cases, but the number of scrap bits of MDF and 4" sections of abrasive that I'd need to save to make up for the price of the planes would be rather a lot
Nic