Using anykind of manufactured lumber, is a bad idea. Plywood will delaminate the first time it gets wet. You should maybe check out the IMBA freeride build standards, or the Whistler Trail Standards are a great source of information. You may also want to think about getting permission from the land owners; before you start constructing anything.
Here in Oregon, we are required by the Forest Service, to use high quality natural materials
only. Below, is a link to a thread about wooden features we have built, and are building.
http://forums.mtbr.com/showthread.php?t=519877
Here in Oregon, we are required by the Forest Service, to use high quality natural materials
only. Below, is a link to a thread about wooden features we have built, and are building.
http://forums.mtbr.com/showthread.php?t=519877