Saw something of the sort at JB. I thought it was too expensive at 3k plus, so I decided to do DIY.
I used a PVC coupling, I think its 4" in diameter (nagpabili lang kasi ako), some nylon webbing from Divisoria, and some bungee cords from a DIY hardware store (the one in Harrison Plaza).
I put them together and presto. I think I spent less than 500 bux on this.
Thanks to alien_inside and company...pati na din JB Music for providing the inspiration. This is what I need right now but I got the seminal ideas from you.