Sweet project. I plan on keeping the same physical dimensions (though screws may need to be moved depending on chip specifics) for all future sticks. The NewPac heatsink is identical to the 2Pac's. Any gear built for one should keep working on any newer build without a lot of changes.

The screws are M3 thread, shouldn't be too hard to track down. If you get in a bind on long screws, I have a whole case of about 50mm length bought for R808 assembly before that project shut down.