Traxxas already makes the adaptors and sells them for $8 I believe which I must say is an absolute rip off. You can get a pair of Traxxas plugs for $3 and change maybe, deans are even cheaper. So for MAYBE $3.50 worth of plugs, $.25 in wire, $.05 in heatshrink and no more than 2 minutes of time you're gonna charge double what it costs to do it yourself?

I suppose noobs who haven't learned how to solder yet may be interested but if you pursue it best of luck. Those plugs looked clean.