I did a quick Google search and came up with a number of 40 meters per unit... There are also some scale drawings at this site, so you should be able to calculate the width and height based off that 40 meters assuming this is the railcar you are talking about...
Did you ever get anywhere with this? I am currently planning a model railway for my garden and want AMG 800s running round it (what can I say? I live in Corsica, and they're finally working properly here:
Well, the original post was posted in 2008. Lack of updates suggests maybe it's not getting anywhere fast :-(
I'm a complete newbie in model train land, but I do have engineering degrees. I'm totally not up on kitbashing yet :-( but with a bit of help I might yet get there (I hope).
I also need to remodel my garden to deal with where tunnels and cuttings need to go, and where bridges need to be put to deal with the obvious floods that don't drain away quickly enough. (Reinforcing of tunnels will be done with GPRF tubes, I hope, if the company didn't go bust yesterday).