360 mm = 14.7" Thats a really sharp curve for HO!
That's right. As I said this is the standard curve for Marklin M layouts. I'm not using only this track, since I also have the wider radius of curve.
The radius are R1 = 360 mm; R2 = 474,4 mm (what a strange measure, but...) I don't have curves any wider.
The straight lines are almost all based in multiples of 180 mm. So straight track is almost all as follows:
S1=180 mm; S2=90 mm; S3=70mm; S4=45mm; and I guess I have too those small pieces to make fitting well...
This is the standards for Marklin M. Since, as I said, I want to make a part in AC another in DC, I may use flex-track for this purpose. I'm inclined for Peco... but don't know yet.
how much stuff do you have for it?
I have about enough for a layout this type... if I have to increase the number of items... there are lots of people selling their Marklin M track and changing for the new Marklin C (similar to E-Z Track) and so I can have always lots of items... in there, no problem...
would you be willing to do a quick sketch of the room with the U shaped layout roughly drawn in? It sounds like you wish to build two layouts in one. Different levels sound a like a good idea. I was also wondering if you might be able to design a two sided layout with Portuguese scenary on one and German on the other?
I've done a sketch with AutoCAD and I roughly think this would give it a chance. I have the idea, for this benchwork, more or less like this... In the right part of the layout, I have a building pillar that I can't take

(it's supporting the roof

) So, I thought using this pillar as "support" for scenery. To the right of the pillar I would place the "portuguese feeling layout" in DC with the scenery cutting view from the rest of the layout. The line would come out of a tunnel (upper right) and would go around again in a simple oval... the same tunnel would let the AC track go and pass here too... I want to have there a station building made by myself based in the one which existed near my house. Then, we would turn inside... and there I don't know how to continue... or where to place the station with the staging yard and depot and the containers terminal. I don't have a turntable... so... no problem... I guess...
The wall in the left will have my display case for models... the roof is inclined ... the higher point is above the pillar I mentioned and it goes down from "up and "down" in the drawing...
Sorry, I guess I extended too long my text... but, from now, thanks for the help...
Only one thing more: this sketch of benchwork would have 4 meters in the horizontal, 3.5 in the vertical (the larger dimensions)