I can certainly understand the need for a vacation from theme making. It must be a huge amount of work to finish a theme of this magnitude.
Just know that in my opinion at least the Solaris SSL theme has the potential to be the greatest theme ever created for any DAW. So having said that I would be more than willing to pay for the finished version if you ever do get around to completing it........
Take care and thanks for all your contributions to Reaper.......