A second start for my "White Swan" reefers

[modelsof1900]

Yesterday was a good day - I cleaned my desctop by finishing of a heavy weathering for two mother stock cars and new I can restart my old project with the five "White Swan" reefers. Click my old description of former thread My duff challenge or start here with my last picture



and my insight, that these models are too low - 2 foot to low! All!
I looked to use the reefer door latch kits by Grandt Line and I disregarded one of the primary dimensions of description - the inner height of these cars with 10' - 2". And this a very great and extraordinary height for reefers and boxed cars generally.
Next problem is come by a discussion with my friend who the models will paint and letter if these extra height is correct in such a train where nearly all cars will have a very similar height? Is the difference to other cars too big for brakemen at their walking over the roofs? Ok, I should build a test model on base of the old cars in order to solve this question. And this are my attempts.

First I built a cardboard model on base of one of my old models ...



... and I have given it a "basic face" by a bit editing of picture before.



And so the model will look in train between models of "ordinary" height.



This picture now should be a the base for my questions.



The catolog of Seattle car & Founrdy Co. said that this car has an inner high of 10' 2".
Question is at what for points should I set the marks? The floor level is ok. But what is the upper point when I can't see roof construction from outside? I should consider that there are ridge poles, beams and carlines, that the roof will have a double sheathing and an isolation. Where so will be the metering point?
I have set it at highest point for my test model where it could be - at underside of roof edge and so this model is a bit more than 2 foot higher as other models. What do you think? Is this assumption such one which you can accept? Would you define a different measuring point like I have set it on low edge of fascia board? I think that this could give problems because the jump on roof line or walk boards will be enlarged - and brakemen must conquer larger high differences on their way about roofs.
I hope that you understand my problem and interests to build maybe correct models. Can you accept my ideas and arguments? I'm very interested to read your answers and opinions.

I think you know my enthusiasm for my project and so I have played a bit more mit bits and bytes - and as result I have got these previews to models ...





... also if the cars will have a red or boxcar red base paint.