It is tidy, but the fit is only easy into rear-wheel drive vehicle with a trailing or semi-trailing arm rear suspension; the motor will interfere with the control arms or subframe of almost any multi-link or double-A-arm suspension not designed specifically to accommodate this drive unit. That design is obsolete now, but was standard practice for rear-engined vehicles (especially VW) and for a few decades of rear-drive front-engine cars with IRS... such as BMW, Mercedes, Datsun, Toyota, etc.
It seems inevitable that someone will do a Datsun 510 - because everything get tried with a 510 by someone - but good 510 bodies are rare (they are all over four decades old now) and they are in demand for use with the original drivetrain configuration.
