I thought I'd already replied about senny carry capacity.... but can't now find the post...
ANYHOW...
I got a full set of Senny Seats in to the back seat & Boot of a Senny...
given that I think they're wider than Omega seats... you shouldn't have a problem... the only trouble is adjusting them to actually fit the space if they're electric...
I'd knock up a lead to a ciggy socket connector and make a note of the pin positions for the seats, then just power them when necessary to change the shape to get them in and out of the car.
I got the 2 parts of rear bench seat in the boot at an angle, and the 2 front seats went into the back seat, with the headrests over the parcel shelf and the seat base pointing "down" into the rear footwell....
angle adjustment was a required to get the second seats in.... and I had the Senny's own fronts seats moved virtually all the way forwards...
a bloody uncomfortable drive home though.,..
Bet you wish you had the stretch senny limo now eh Tunnie