After much deliberation and advice from MM and JWH92020 I have decided to do a BOC screen for now. Joining two pieces of Sintra to make a large enough screen sounds like a hearbreak waiting to happen. I did find Sintra in both the 3mm and 6mm 2M x 120" size sheets. I concluded that the 3mm at that size would be too floppy and potentially troublesome and the 6mm won't be available until near the end of October so I'll probably just do a BOC screen and if I can be convinced that Sintra will be a big upgrade I'll build one in the future. Apparently this forum doesn't get much activitiy as I haven't gotten much in the way of repsonses to my questions here so this will also give me time to read through the thousands of threads with tidbits of information and extract what I need that way.
I'll post a thread with pics so people can have something new to look at.
There is nothing either good or bad, but thinking makes it so.