40% staggered or 4x15 ortholinear PCB for 60% tray mount cases with only through hole components.
Make example for this keyboard (after setting up your build environment):
make peej/rosaline/staggered:default # for staggered PCBs
make peej/rosaline/ortho:default # for ortholinear PCBs
Use usbasploader in hsgw's repository.
See the build environment setup and the make instructions for more information. Brand new to QMK? Start with our Complete Newbs Guide.