I speak a bit.
It was a standard road car (not from NL orginally as its wearing a 'new style' plate, meaning its come from somewhere outside NL).
Front engine is a standard 3.0L. 245bhp
Rear engine is a 3.2 from a 156 GTA, also running 245 bhp
Rear engine mounted on a 166 subframe, to which everything is mounted. Cooling was an issue, but he modified the rear spoiler to push the air downwards in to the radiators.
The exhaust for the rear engine is completely custom, the right exhaust is for the rear motor, the left for the front.
He says the synchronisation between the two motors was quite simple, using the gearboxes and clutches. In the car, everything for the front motor is on the left, everything for the rear on the right. You start the front engine first, and then the rear.
Driving the car is an adventure!
I think he says the speedo cant be relied on, something to do with the gearbox system - so he has no real idea of how fast he is going
It cruises very nicely between 160-180kph (100-110 mph). It catapults out of corners very well, and he enjoys driving it in the mountains.
He talks a bit about the gear ratios. In theory itll do 290kph, but he doesnt want to try!
(Not bad for my self-taught Dutch if I do say so myself!)