I thought I'd post my status on the "maybe possible" maps:
S200_64 (5,2): Bradsometum (I)(-)
Nov 10 2017: I've gotten to two reactors and one mortar and a reasonably large 10 height "fence", but one mortar isn't sufficient to keep up. I'm building in the lower left, quickly clearing a placement for the command center as the original placement gets overrun too fast. This is very hard.
S200_187 (7,3): Abertoft (?)
Nov 10 2017: Haven't tried, need to clear my way over to the right side of the map first
S200_119 (9,2): Madotis (I)(-)
Nov 10 2017: Haven't tried, need to clear my way over to the right side of the map first
S200_74 (4,6): Furham
Nov 10 2017: I have tried this a little bit, but only in the original position. I think doing the lower level in the right corner is probably better.
S200_162 (2,8): Molzacdai
Nov 10 2017: I have tried three different positions. The original position, down to the right, and even clearing a new placement in the lower left corner. I don't get anything working. I think it's easier than Bradsometum though.
S200_2 (2,0): Fantolet
Nov 10 2017: I have tried this a lot. Gotten to 4+ reactors and two mortars in a sizeable placement in the bottom (attaching screenshot). That said, I keep getting overrun. This is probably the easiest of the ones I've tried.
Nov 11 2017: I'm surviving several waves of air attacks. Seems like you need larger than 6x4 starting position though as you can't fit enough mortars given you need 5 beams to defend against air. (see attachment).
Nov 11 2017: I'm surviving multiples waves of air attacks. You can go down to only 4 beams. However, by minute 18 you probably need to be at 6 mortars, and I don't see how you can get enough energy to sustain that. This is really really tricky. I'm attaching screenshot of my furthest progress.
S200_158 (0,4): Penbor
Nov 10 2017: I'm doing the lower left. I get to 10-height wall, but no mortar. Might need to prioritize mortar earlier. I haven't tried this map enough yet.
S200_153 (2,1): Luumulyr
Nov 10 2017: I haven't really tried this one. Seems like original position is the best start, but you only have ~55 seconds to get a wall up. Seems very tight.
Overall, I think Fanotlet is probably the most likely to be "possible" of the maps I've tried.