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Your best bet for a really solid TKL Alps board would be a Kingsaver. One sold on eBay a few months ago with an acrylic case similar to the one you linked, but that's the only acrylic cased Kingsaver I've ever seen.
Elton has some Kingsaver kits for sale here. These have an aluminum case. You would have to solder in the switches and find some keycaps. The ideal keycap donor board is a Wang 724.
Thank you!
So it's the Kingsaver my only option or my best? Seemed kinda expensive, for what I'm understand they've been used? Love to have one n ALU though...So I dont have to buy anything else (like a Teensy board) just keycaps? Thank u so much for the help!
Well, they're technically "factory seconds" so they have some small dents and scratches, but mine came from that batch and I can only find one miniscule scratch on it. It might as well be brand new. That kit comes with everything you'll need except for switches (which you already have, of course), keycaps, and a mini USB cable.
The Filco Zero isn't quite as fancy as the Kingsaver but it's a very good option if you don't want to pay the premium for a Kingsaver. The only problem is that it's no longer in production, so you'll likely have trouble finding one. They came stock with white alps clones, so you would again have to solder in your own switches.
The Ducky DK1087 is the only other option I can think of. I've heard that the build quality is pretty bad all around, and it's been out of stock everywhere for quite a while, so finding one may be difficult (though not as difficult as finding a Filco Zero).