Hope you're doing well.
On my last layout my Uncle came up with a pretty good way to super elevate curves.
It is easier to use on open type framework baseboards.
This may be hard to explain in words.
On the ends of the layout the baseboards are opened framed. A 180 degree curved baseboard was cut out of a sheet of 15 mm ply which was wide enough for a dual main line. This piece of baseboard is just like how you would cut out your baseboard sections for a helix. It just looked like a big U, 120 mm wide. I hope that makes sense.
The big U was then cut with a jigsaw up the centre, between where the two track would be laid. The cut did not go through at the ends. The ends sections of the U were still in one piece.
The big U was then placed on the open framework and the end sections were secured. Small shims were made up (I can't remember the thickness) and placed under the mid way point of the big U base board. A shim was placed under the outer side of each road section (as it had been split). Once the shim was in place the two baseboard sections were screwed down to the framework. This placed each split section of curved baseboard at a slight angle (super elevation). The neat part about this is that the superelevation transitioned nicely from the secured end sections (not split) to the maximum angle at the mid way point of the curve, determined by those first shims. Shims of lessening thickness are then inserted under the track base as you reach the end points of the curve and the curved base board secured.
Basically, this method uses the natural twist in a timber base board section to create the super elevation transition, rather than shimming directly under the track it's self. It tends to keep everything smooth.
We had no problems with running trains and it looked great.
Wow, sorry for that hugely confusing rant.