You are right that they are built on a truck chassis.
Yes they do run a Ford v8, yes they run a ford 4 speed box, and yes they run a Ford axle. but there are a lot of bits unique to the Loyd that would be hard to find, and hard to make.
Alistair is pretty damn brave, but at least he started with loyd bits.
Anything is possible, but you would have to be a real masochist.