Not unreasonable as a exercise to getting familiar with PCB layout tools and Gerber files.
But a new board design for an obsolete chip?
Image of the layout, do Not show footprint for decoupling capacitors!
0.1 uF Ceramic capacitors, 25 V or 50 V, one each side of the package.
These must be put in place, right next to the package.
Connecting decoupling capacitors to the pads along the edge of the board, is not acceptable.
Curiosity HPC board also use 1.0 uF capacitors in parallel with 0.1 uF.
8 bit PIC devices in 40 pin package are mostly pin compatible,
so your board layout may be useable also for other devices in 40 pin PDIP package,
like PIC18F45K50 with USB,
or for devices without USB, like PIC18F45K22, PIC18F46K22, PIC18F46K40, or PIC18F47K42.
Some of the newest PIC devices have internal pull-ups for all pins.
You have selected a device with USB.
If you are going to use USB communication, be aware that there may be some additional layout requirements for USB traces, and maybe try to design a USB connector into the layout.
Curiosity HPC board DM164136, is able to place layout and socket for 28 pin device inside the 40 pin layout.
post edited by Mysil - 2019/03/24 10:48:55