MakerBot Print is our newest print-prepration software, which supports native CAD files and STL assemblies,
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The power brick/section should be part of the mini_itx_ryzen.scad file, uncomment "case_power_expansion()" near the start of the file. It will look weird but when you render it, it should look ok.
I didn't design it to fit an SFX size PSU but you can run the ATX cables into the case and maybe design a way to mount it.
I just uploaded my latest revision which uses a Pico ATX PSU instead. If you haven't already bought the SFX power supply, I'd recommend that if it fits your power budget.