This sounds cool, Bubbles! The incursion board is designed so that you can place two together side by side. Do you just want to do a single board? I'll get the dimensions for you in 10 hours, once I'm at home.
As far as fielding ss and airborne troops, Incursion and SNAFU have base lines for regular troops and powered armored infantry. So starts with counts as: regular troops would have a similar stat line to the MI-13. Then tweak to flavor: guys with standard issue rifles only get a single DD due to their lower rate of fire.
And Robo-Hitler? Get a Hitler mini, cut off head, place in jar, attach to any robot miniature that catches your fancy!