[seL4] porting to a new platform

I'm trying to port an old sel4 code base to the latest so I decided to take the sel4test manifest & work through through the following page (https://docs.sel4.systems/projects/sel4/porting.html) The old code base does not add the new platform the same way since the new code seems to have some new CMake macros that do most of the heavy lifting. Is there a test project that does this with an arbitrary platform that I can use as a reference? My platform defines don't seem to be coming through correctly. Is working through the porting page the best way to do and does it seem current? Thanks.