Need help converting DtD to GURPS

[samd6]

Dungeons the Dragoning can be found here

My major problem right now is finding what some appropriate limitations and enhancements are.

What is fair pricing for "X times a scene"? Or would it be better to go with recharge, and if so, what should the recharge be?

For ER, what bonus should "not tied to a power source" be?

I know that I can't get all the mechanics of the game converted, but I'd like to try for most of them