I'm interested in constructing a footbridge to span a drainage ditch into my 2 1/2 acre pond. The span would be about 10 to 12 feet, and I would want the bridge to be able to handle the weight of me and a 50 in riding mower. I have found only one source of plans, http://pacifi.ca/index.html. Has anyone construced a footbridge using this type construction? Where else might I find plans? With average carpentry skills would I be better off purchasing the arch assemblies?