Yeah, I saw those brackets too - but I didn’t like the vent holes.
Re: setup - my concern is that the single RFIC PCIe board is a developmental dead end. I’m a hardware developer by trade, and to me it smells like a deprecated product. The USB version seems more mainstream, and so I’ve shifted my efforts there.
Re: the FPGA - the Lime PCIe card should have come with a USB stick. That has a pre-compiled FPGA configuration file you can try (just in case it’s the compilation process causing trouble).
But FWIW it seems there are some motherboards (mine, as referenced earlier) in which the Lime doesn’t properly enumerate. If you can test your board in a different PC you might find the same thing.