I’d take a step back and look for options that could be used across the four genres you stated. I mean “Trees” are always a given, but perhaps “muddy” or Cobblestone roads could be used for the Victorian Science Fiction, Fantasy Town and Blood and Plunder.

With the BT terrain, we did make a load for it down at the club. But we found we kept reverting to the printed maps that are available for the game (plus they don’t need painting). Putting the money you were going to spend on the 3D terrain towards buying more maps could be an idea (plus mini’s don’t fall off maps 😀 )

I’ve found solo wargaming to take up very little time for actual gaming. Some time to prep for the game, such as creating warbands, reading the rules, and making reference sheets and stats to put on index cards. Majority of the time for painting miniatures. What a game does is focus you on what to paint, and then you might paint some additional stuff (eg. other bits on the same sprue, assembly-line of ten of the same models when you only need two). Yet, if you select a game (eg. generic fantasy) that you’ve already painted most of the mini’s for, you’re not faced with an overwhelming number of mini’s to paint.

So, with scenarios taking 30 minutes or less, I’ve finished campaigns for “Lasting Tales”, “Five Leagues from the Borderlands”, “Sellswords and Spellslingers”, and now I’ve started another “Lasting Tales” campaign. Found out about “Doomed” and will put together that Battle Systems “Shanty Town” that’s been sitting in the corner of my gaming room for I don’t know how long… 😛