Making a TT game in computer format, with ALL of the TT rules built in and computer controlled opponents would be something that Battletech fans would pay good money for.
Something along the lines of Mechcommander, but turn based, hex based, with TT rules, weapons ranges, 'mech customising rules and the like. In fact, something like Fallout Tactics where it is RT until battle starts when it reverts to TB would be a pretty good platform to put the whole thing on.
And, of course, you will need to put in all of the stages in the round (i.e., move stage, weapons fire stage, physical attack stage, cooldown stage, etc.).
A game like that would be an instant hit with BTech fans, the storyline be damned, really. Throw in moddability and map/mission creator/editors and you will have fans buying and playing that game for the next 20 years. And all you have to do is release mission packs and stuff until technology advances enough for you to re-engineer the same game but with better graphics and speed. BTech has been around for 30+ years and still has legions of fans and players. There is no reason to "upgrade" the basic game in the slightest.