Well I didn't do the mod to the engine box, that was aerobob's handy work. Generally I just mount everything outside of the box and zip tie it to the sides. In this case it was a nie clean install and the work was done, so why not use it I readded CA to the holes to mak sure the screws stay tight and they have nylon washers under them.

RF wont be a factor because it's metal on wood... but you dont want it coming off in flight

Felt clunks are nice to run on gasers... I just use a plain Jane one. I have an electric Jersey Modeler which has a filter inside and a nice inline filter that the gas goes through before it reaches my plane.