Quote: Oops, too late, Dodgeman already has a 200B wagon, but will gladly use it in trade for a 1600 Wagon.

OK, here's my view.
Keep the Lagwagon & do some improvements from time to time.
Buy the 1600 if you want, but don't make it another project. Leave it basicly stock. Add some nice wheels, open up the exhaust a little, upgrade the suspension a little but keep it as the sort of vehicle that you can just jump in & drive, anywhere, any time without feeling the need to apologise for the noise, the ride, the draught or the cold. Keep the coupe to scare yourself ####less in when going round & round, & keep the wagon for scaring everyone else.
Get rid of all other projects. This then should give you a Datsun for all purposes, like Easy street, Fast street, & track. You should be able to develop each car without an excessive drain on the wallet while keeping a desirable example of each model.
Works for me.