[Strawbale] Plywood vs. osb for gussets ?

[Ken Simonelis]

Hello people, I was wondering if any one would care to hazard a guess about the following. Come the spring ( it will come won't it ? Been snow on the ground since Halloween this winter and cold to boot, a very traditional Northern Alberta winter ), I will be making a small ( 400 sq. ft. ) cabin combining the techniques of using a wooden rigid arch and straw bales for the walls. I've used these arches around the farm for making small out building for the last 25 years and they have stood the test of time very well so I thought to myself  it would be worth the effort to combine  the system with s.b. and get that much closer to furnishing shelter directly from the farm's collection of resources.
    The arches themselves are straight walled with a gable roof ( low slope ), sort of a 'whole house truss' if you will. The specs come from information sheets available from the American Plywood Association, and here's where my question comes in. Naturally enough, the plans call for various sizes of thicknesses of plywoood to be used for the connecting gussets. However since the hurricane season down in the U.S. did not amount to much this past year, the cost of osb has dropped ,locally at least ,by about 2/3's, and having been caught short in the last price spike, I bought several lifts of osb in anticipation of various building projects in the near future. Plywood , however, is still way up there in price, so I was wondering if, for this situation, I could substitute osb for plywood when building the gussets for these arches ? If it's a dicey situation with the numbers could I use osb of a greater thickness and adequatly compensate for the difference in the two product ?  Cheers and thanks in advance to any who might shed a bit of light on this matter.