OK, to answer at least a couple of the questions here -
"which joy bases do they fit?" - Right now, they're designed around my Competitions, but I'd like to make a version that'll fit both Competitions and Supers (since they seem to be the most popular). I'll have to get my hands on a Super myself first tho...
"how secure is the acrylic top?" - My plan is to actually mold the top to the stick, which should make it as secure as any other stick. I currently have the top press-fit on with an o-ring (so I can access the LED more easily), but I'd probably mold it for a final product.
"Is it possible to 'texturize' the bat tops?" - I'm making my molds from a textured bat top, so it all depends on how well the mold will transfer texture... so I'll have to get back to you on that one.
It's still just a possibility that I'll be able to offer these for sale - It takes me a good amount of time to machine the sticks myself, so If I had to personally make each one, I couldn't really sell them for a reasonable enough price to make it worth my while, so I've given one out to a machine shop to get a quote on how much they'd charge to produce a bunch of them for me. And of course I still have to mold the tops and everything, so it'll take a little while to get the hang of that... If all else fails, I should be able to produce at least the clear balltops like I've shown, if the machine shop's quote is within reason of course. Thanks for the feedback, and keep it coming (not gonna go through all the trouble if noone is interested!)