Hangar Flying

I'm going to make my own throttle quadrant (just having fun).

I was wondering everyone's opinion on the following:
1. Is a in-flight adjustable friction lock desirable?
2. Is a stop to prevent the mixture being closed accidentally desirable?  I'd have a simple spring loaded plunger you'd have to pull to allow the mixture to be closed the last 1/4 travel.

Thanks.  I want to keep things simple and light, but also want these features if they are useful in the real world.

Regarding the throttle and mixture controls:

I want to use push-pull controls rather than spring loaded, but want to use handles instead of Cessna type controls.

Does anyone know the pivot length from push-pull rod to pivot and handle to pivot?

Any drawings of home-made throttle quadrants out there?

Any make/model manufactured throttle quadrant that is best for a Long-EZ?