Joining of biger scale objects

Hello,
i will soon star to build big "model" from thick (6mm) cardboard.
It will basicly not be an model, but construction of some sort.

It will be around 3m long and 1m wide.

So, till now i joined paper parts together with superglue (for small paper models).
Since model will be to big for superglue i must use some other type of bonding material. I like super glue becouse of its low amount of dry time.

Bonding material could as well be an ductape, because it will not be seen at
finished product.
( i will cover it with epoxy and fabric at the end and spray color over model )
Ofcourse i will cover it with varnish before epoxy, so epoxy doesent go in the cardboard

Thanks for help