Mobile scaffold platform

[Frank S]

Those appear to be 2x6 joists. I'm guessing your using 16', and it looks like your splicing them by pairing with another one in the middle of each splice.
Are you using the nailer to attach the plywood to these joists? I've always used construction screws to assemble scaffolding.
This photo was my house addition, where I tore the roof off and put a second floor on.

the stringers are just 2x4 on edge doubled by nailing there are 5 of them under the 3/4" plywood the Brick scaffold I have set up on the bus is only 7' 2" c/c of each frame set the connecting pins are bolted to the bottom and the top frame sets not just slip fitted once the platform is completed and I lift it to the top then it will be secured to the frame sets mostly because our winds could turn it into a sail if it was free to move. I have jumped up and down on the platform while it is laying on the stands there is little to no give so it is plenty strong. I have some 2 x8 planks but not enough to make a full platform.
Screws would have been nice to attach the plywood to the stringer but I only had either some 1 inch or some 3 1/2" 1 inch would have been too short and the 3 1/2 inch would have been ridiculous to use. The nails are also 3 1/2" and are going to be hard to remove when it is time to reclaim the lumber and plywood but I was out of 2" for my smaller nailer