28" curves made easy:
BUY a 6" plank to inrease your 4’ to 30". (Who doesn’ have 6"?) Re-lay your curve.
Larger than 28" curves:
Do You have a 4X8? It fills a room because you have to wallk around it. It needs ACCESS on all sides. (Your 4X8 takes up a lot of room).
Use the walls. Most bedroom’s are 10X12. Smallest are 10X10.
Cut your board into quarters and shove into the corner’s, and connect. them. 46"r? -Piece of cake. Operate from the inside. Now see how your 4-8-8-2’s look…
Main engineering effort will be a lift - up OR drawbrige type entry