Hi bushfly,
The Oratex 600 is approved for aircraft with a MTOW of 1323# (600 Kg). The 6000 goes clear up to 13,228# (6000 Kg). The 600 can probably be compared to the light PolyFiber fabric. I think that a SS7 covered with 600 would be marginal. The airframe is designed for 1550# gross, & you would be limiting yourself if you ever wanted to increase your weight to that limit (taking it out of the LSA category). That would be my concern. The 6000 is tougher, while still being considerably lighter than a conventionally finished/painted covering.