The images captured above & below are of a homemade swing planer board. There are many free plans & youtube vids available on-line explaining various methods of construction. The "trainer board" offers e-z adjustability for different length clubs which is generally a complex build when using pvc pipe build. The thought occurs to me that one could use 3/4" or 1" urethane foil backed foam board insulation for a light weight indoor build. The 2 x 4's could be ripped in half to support the foam board lowering both weight & cost.