Sell it and start over.

You're probably going to have to fabricate parts to get it too work.
Here's a good place to start for trike conversions:
http://www.electricbicyclesmagazine....ang-page1.html. Once you've finished reading the first page click the yellow arrows to go to the mid drive vendors. Then select trikes once you're at each vendors website.
If money is not an issue you may want to look at
http://www.ffrtrikes.com/
There is also
http://www.utahtrikes.com/ for various models of trikes to put a mid drive system on.
There are plenty of other members on this forum with more knowledge than me when it comes to trikes so hopefully they'll also respond. I've been very interested in trikes myself due to my addiction for speed and the trikes low center of gravity.