excellent design, well-executed...and very nice to see such a nice Revell layout. As for "Torsion box", I agree it's commonly called by that name...but one might as well call it a "Shear Panel" cause it does that too. The point is, actually, that it is designed to resist bending in 2 planes, efficiently...and a natural by-product is that it resists torsion and shear. If a "Torsion box" were actually idealized for torsion, it would have a square cross-section (even more idealized, round). Just like if it were optimized for shear, it would be thinner. *grin* My 2 cents.
Meanwhile, to bring this back to Slot applications, the point is...you can do this even more efficiently for a routed track...where the table top is a thin material (1/8"-1/4" sheet) and the upper layer is the routed mdf itself. The trick is to elevate much of the track to a greater or lesser extent and allow the track supports to act as your middle ribbing and carry the shear (between top and bottom). I've done this on my own layout and it creates a remarkably stiff track layout with very little weight or material cost.
John
Meanwhile, to bring this back to Slot applications, the point is...you can do this even more efficiently for a routed track...where the table top is a thin material (1/8"-1/4" sheet) and the upper layer is the routed mdf itself. The trick is to elevate much of the track to a greater or lesser extent and allow the track supports to act as your middle ribbing and carry the shear (between top and bottom). I've done this on my own layout and it creates a remarkably stiff track layout with very little weight or material cost.
John
