I have finally gotten a car again.

I need a good heavy duty holder which will:
1-hold a N900 with a Mugen cover
2-hold the phone securely even in moderately rough off road driving
3-enough flat space over the battery cover area to add a Qi charge pad rather than using USB.

I am open to modding an existing holder to fit. it would be nice if it easily pops shut to hold and open to grab the phone using one hand. I am not sure if I want to drill and tap the floor or use another mount to the vehicle, I am open to suggestions.

About three years ago I bought this combo:

http://talk.maemo.org/showthread.php?t=81939

It holds really well on-road. But I'm not ready to part with my mount. Maybe it's an idea for you to create something similar and better suited for your needs...

GRTX Daniel

danielronde, that looks great though the otterbox will not fit with the Mugen/double scud battery system as well as the Qi charging mod.

For secure rough terrain I recommend the brodit A pillar mounts.
There adapter is made to fit the N900 it wouldn't be suitable.
Not sure if they do a universal type that fits onto the A pillar mount.