Finally got the air compressor saga behind me and after 3+ attempts, was able to finish riveting the fuselage bottom skin.
The remaining stuff to do is to put the center tunnel back together (dress wires, system blocks, flight controls, etc.) but will handle those at part of wrapping up the ADS-B installation.
In retrospect, I am so, so, so glad that I went the route that I did. Very happy with the decision to replace the fuselage bottom skin and both tail cone bottom skins and doubly happy with the results.