How Long to Dry

Yes scarf joints were looked at but both I and the engineer agree that with a 1" router bit that the curvature created in shaping the wood and the fact that the join will be approx 550mm long will negate the need and dificulty in creating accurate scarfe joints. It was definately a big concern went theinital thought came about. As the the epoxy sealing I dont belive that painting the existing structure as seen in the pic will be a prob as there is a good amount of epoxy fillet protruding from the base of the stringers also if it were to be lifted and coated would that not mean that such a process would require almost 100% dissasembly of the structure making it not a rebuild but a build using second hand material that is already cut to size?
If I was going to do that then I would just design and build from new. As it is its already turning out to be bigger than Ben Hur and expensive. The only reason for the continuation of the project is the fact that the money has been spent on material already and building from scratch would be a similar $$ figure

Cheers For everyones help, opinion and advice your conserns are really making me double check and think through all processes and methods and is much appreciated.