If anyone is interested in a springboard floor for a dojo we have 16 segments of 4x8 foot platforms (were bolted together and sitting on a concrete floor in a space we just vacated)
Extremely sturdy (glued and screwed together). Each section is made of 2x6 inch beams and 23/32 plywood.
Located in South Florida
email
johnpfoley@yahoo.com if interested