Cherry Pi III USB and Ethernet box

My original "Cherry Pi III USB and XBox power box" worked well - but I found that the XBox 203W PSU just wasn't powerful enough to drive my printer. As soon as I turned on both the hot-end and the heated bed, the green light on the PSU briefly turned red and the controller board reset itself.
After changing the controller board from RAMPS to Duet I realised that I needed an ethernet port as well as one for USB, and I wanted to remove the hole for the XBox socket - but making changes in FreeCA