As far as I recall, this stc'd mod came from a brit company, it put everything under the seats ( no more worries about too much luggage, as there won't be any anymore!!
).
Cyclic sticks coming out the in front of the seats, which of course also entailed to moce the breaker panel - if I recall correctly.
The whole thing weight in a bit and cost only 14 K in US$ - that took care of it!!
I think there are no more than 5 of these around.
FWIW,
3top