When TRO: 3050 came out, I didn't have rules for the Clans until MW2e came out. I tend to separate the Clans from the Inner-Sphere; I'll run a game, were all the PCs are Clans or, they're all Inner-Sphere (Kurita, Fourth-Succession War campaign, in MW2e, etc. Now that the new stuff has come out, I'd like to run a Clan/Inner-Sphere integrated 3145 game.
Oh, yeah. BattleTroops, itself was a fine game. Since I don't know anything about MW 1st ed, I kinda wonder if that was the inspiration for the format chosen. . . .
Not even close; the one thing I like about Fasa, is they were very creative with their gaming-systems. Every system (Shadow-Run, Legionnaire etc.), is different. Every game-system is different than the previous one, no matter if they are a part of the same game-line.