For this new RealAcc XS220 frame, I modified my original design of the X210 Lipo Protector .
Now the mounting holes are 33mm seperated (center-to-center). It's also a little bit more wider, because of the mounting holes.
Realacc XS220 frame - https://droneracingparts.nl/xs220
I made this so it fits 4S 1300mah lipo's. It wil also fit 5S lipo's but it is tight. Make sure you use long enough lipo straps. I normally use 20cm-25cm.
Also check out my video about my new setup based on this xs220 frame with lipo protector.
It's in Dutch - https://youtu.be/PPp5rwmujqE
Depending on how much weight you want to carry, choose an infill of 10% to 30%. Better use at least 3 lines for walls so it can handle some scratches.