The engine is available already. Radiator (in radiator kit 3370) size is 145 x 110 x 25 (mm), not including the two 10mm dia, and 10mm long hose stacks, which are 72mm apart and perpendicular to the radiator body. Cooling air passage dimensions are 100mm x 110mm.

Edit:
The pump is part of the motor, The radiator kit is optional.

edit 2, a picture tells a 1000 words, so I share my looking at it. It realy is a piece of aluminum art, and extremely light. see [link=http://www.mvvs.nl/MVVS/main_bestanden/petrol.htm]my website[/link] for further data