It all started as a single Oly engined scaled-down Victor as a Buccaneer alternative turned British U-2 type.
It is indeed the engine intake under the cockpit. I thought the Victor's bulged throat (for lack of a better term) would make a great intake.
It is pure Victor from the intake lip aft. The cockpit section is a MiG-27 one (as I have one spare) with underside cut down slightly to un-mask the intake. The cockpit is scaled correctly for a 1/72 MiG-27 cockpit to be married to a 1/144 Victor fuselage, plus or minus a pixel. The nose is based on that of an Atlas Cheetah D but is not scaled. The wings are Victor minus the intake sections moved forward to the original wing root.
As for landing gear, I think bicycle would be the best way to go with outriggers deployed from the Whitcomb bodies/Küchemann carrots on the trailing edge.
Its really meant to be an evolved kludge as only the Brits can do.