Getting back to the subject of this post which has been running since I think, October, I have finally, I think (in theory anyway), cracked it with the Ford KA and bought a ROOFRACK for the folded boat here: Steel Roof Bars to fit Ford Ka 3-Door Hatchback 1996 Onwards | eBay
This will enable me to strap the boat, uninflated in it's bag (the one supplied), with a couple of simple boat straps that I already have, and free up space in the Ford KA. This is perfectly acceptable for the 1/2 mile journey to the drawdock in Fulham.
This will free up space in the boot for the motor ON the trolley and fuel tanks/wheels. With the Rooteq trolley, if the measurements of the Outboard on the trolley and the measurements form the Ford KA with seats folded down are correct (and I think they are), I will be able to load the trolley, taking the handle completely off and sliding the head on a pillow, up to the passenger seat and wheels towards the bumper, without removing the motor from the trolley. With this (and visa versa unloading), set up time and ease and strained back etc. should be much improved. I might even buy a wheel or something to strap onto the head if there is clearance for the boot.
I feel tremendous progress has been made here in ease of setup and I will be posting a picture of this when I go out on Friday (if the roofrack comes on time). The boot setup anyway, I will try even if it means making two runs.