Matthew James Bellafairealright, i finally finished the PCB earlier this week and sent it off for production from JLCPCB. and the parts are all ordered from digikey and have already arrived. I'm mostly happy with the overall design. Considering how much time it took me to route the PCB it would have been significantly more difficult to create the same design on protoboard, additionally the protoboard version would have been significantly more fragile which would have been a problem with the intention that this board would be on a spinning platform.
as for the part choice, this all mostly boils down to "i used what i know", the majority of the design is taken up with 595 shift registers and some surface mount transistors on the ground side. so i guess for the time being this project is on hold until i get all my parts in hand to begin moving forward again.
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Re fragility -- I worked on a similar project a few years back, and you're definitely right to be concerned. I was using a prebuilt LED module with graphics produced from an ARM SBC processed through an FPGA development module. I had these and a power supply regulator along with some buffers (because the FPGA didn't provide enough current to drive the shift registers on the LED modules at high enough frequency) mounted on stripboard, but I had a huge amount of trouble preventing cables from coming loose. I used a *lot* of hot melt glue on that project. :)
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