Afraid not, there is no accurate data on the number of Marinas left, let alone by body style or trim level.
Most Marinas are registered and appear on howmanyleft as Deluxes or DLs. The reality is that the majority of surviving cars seem to be SDLs followed by TCs. From doing the census data (We have over 600 cars on it now) it would seem that 1.3 Marinas were always more popular than 1.8s, or at least survive better presumably because of the lower tax prices on a 1.3.
Once Ben has sorted out some new graphs and got the census data together (which is still ongoing) then we will have a far better idea of how many cars were made of what type and trim, and how many are left. I am trying to get as many cars as possible on the census and I am confident we can easily reach 1000 cars on there (I only have to look up reg numbers either side of the cars already on there to find out about more Marinas!). That's still only 1000 out of around a million made though!

Amazing how nearly a million cars can just vanish!