Managed to get a few Lattice iCE40HX8K's in the CT256 package (256 balls 0.8mm pitch BGA).
Next thing I want to try is breaking out a small BGA. 0402 are the smallest thing I can do by hand. Had to learn how to do soldering using a stencil, paste, hot air station, and a hotplate because no one is hand soldering 0.4mm QFN packages. Probably my crowning achievement at this point is making an 1.8V LVDS to TMDS level shifter board so I can get HDMI 1.2a (4x 1.65 Gbps lanes + sidebands) out of an FPGA board I repurposed from some cryptomining hardware I bought on eBay.
Used a tool to compute minimum trace spacing to stay under a certain capacitance for a specific copper weight, board thickness, dielectric type, etc. I've made some retrocomputing boards ( 4 layer boards can be had for very cheap these days (JLCPCB does 10 for $30 w/ ENIG boards up to 10cm x 10cm), so I followed the "just do yourself a favor and get the 4 layers boards so you can make ground and power planes" advice. My electrical knowledge is an introductory electromagnetics course I had to take in college that I've mostly forgotten, reading/watching EEVblog, other internet sources, playing around with cheap and/or old parts, reading whatever I can find, etc.
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