As regards to making plans here is a teqnique i use. I find this helps me a great deal, however i am using TS Modeler. Here goes:
1) get a peice of A4 paper.
2) get a model of your project (it helps to be into model trains) I use 00 guage stock.
3) get your tape measure out
4) using 4mm to 1 foot start taking measurements.
5) basically on the paper draw rough plan views of said loco or wagon. ie side, end, top.
6) on the back of the A4 sheet work out all your measurements as i am not good at maths i basically draw a line to the required length eg the roof is 8cm long, draw an 8cm line making sure you mark the seperate cm's on it. Then add a little dash above every 4mm. For every 1cm you get 8mm which is 2 feet. You also get 2mm left over which is half a foot, mark this as a little 2 above each cm. So for every 1cm you get 2 and a half feet. Get it ?

I hope so as i am not very good at explaining stuff
7) Finally add all your "converted" measurements to the drawrings on the other side of the sheet, making sure you put them down in FEET. There have been times i have used the measurement before conversion on the 3D model leading to much head scratching because its too small.
8. Once you have your main measurements written down you can start your 3D model
9) Do not be affraid to make some things up. You can pretty much guess a window frame for instance will be about 2 or 3 inches wide. So long as you get the lenghts, height and widths of the main parts right you will be ok.
I Hope this helps someone as after writing it i am convinced its all just drivvel

But it might help someone out there. Sorry too if anyone feels its gone off topic so to speak, but i felt it was relevant somehow.
Kindest Regards Tim
