All looks fine to me. Think I'll weld an extra bit of steel to Drumroll's baseplate where the lipo is though, just to make sure I won't fall foul of the rules.

The only minor quibble I'd say is regarding the wording of rule 11.2:

Rotational weapons exceeding any TWO of the three limits below must be submitted for review and be preapproved by the event organiser.
Obviously the majority of featherweight spinners exceed two of the three limits, but I remember the last time I queried this, I seem to recall someone saying that exceeding the limits was only an issue if you were running a 'spinner' (more akin to a rotary flipper) in a Class 3 arena or less. While that makes sense to me, is it worth adjusting the wording of the rule to clarify this? Just in case any new people coming along that are building spinners for full combat events are worried that they have to stick within these limits to be legal.