Firmware help for Wolfpaws Design

First I want to say big thanks to Wolfpaws design work in creating an awesome project.

I am having trouble with the firmware side of the design as I am quite a noob when it comes to coding.

I cannibalized an old Ender 3 with a BTT SKR Mini E3 V1.2 hoping to do this project over a weekend but have hit a wall. My understanding of the firmware process is to install a vanilla version on Marlin and adjust the parameters to match the SCARA/polar design. The problem is I have been stumbling through the code and getting nowhere. Am I barking up the wrong tree?

Cheers for any help

I also have a MKS Tinybee board but am waiting on the stepper drivers