The dimensions of the PCB are 50mm x 50mm.
The PCB supplied with the kit is professionally manufactured thru-plated with solder mask top and bottom and screen print overlay on FR4 laminate with RoHS finish.
If you want to etch your own PCB you can use the artwork above. Unless you are able to thru-plate your own PCB you will need to solder component leads top and bottom where required. Also look for the single via on the board that will need to be wired through.
The ready made PCB supplied in the kit has through plated holes so this does not apply.