Base for Rad 1 curves

[Wet Woking Neil]

Before I start hacking up bits of wood, is there anything that is the ideal track base l for rad 1 curves and or other radii curves. Initial thought is series of small plywood blocks maybe 2' x 1' with potential 20-30° wedge ends. Alternative maybe an open PVC frame. Or is there non wood Alternatives? Any suggestions/recommendations appreciated.
Thanks
Neiĺ