Got my hands on a Sprint Airave (full model number SPDSC26UCS) in the hopes of being able to hack it, but the FPGA ended up being an Altera HardCopy II chip, which is basically an FPGA that is hard-coded to remove the FP (Field Programmable) functionality.
So, not wanting to waste a $40 investment, I decided to take pictures of the insides in the hopes that it will help someone figure out some hacks for it.
If you need more-detailed pictures, let me know and I'll be happy to take them for you. I hope to get some logic analyzing going at some point so I can spoof the GPS data.