Well, OSH Park and alike are surprisingly good now, I even had some success recently with an ice40lp WLCS16 package (by pushing well beyond the recommended desi

Well, OSH Park and alike are surprisingly good now, I even had some success recently with an ice40lp WLCS16 package (by pushing well beyond the recommended design constraints), got 1 passable board out of 3. So even a very small ball pitch is somewhat suitable for DIY. What caught my eye in this SSD package is a low ball count, so it might be potentially suitable for DIY even without an expensive hardware. If it's possible to route it on 4 layers without too many small vias it might be a game changer.