So, start to glue the side walls on.
The instructions recommend to glue with Epoxy Resin and then back it up from the rear with Epoxy Putty.
Get the first piece and stick it on with Araldite Rapid.
BIG mistake - the side piece slips and slides, won't stand straight and, when i do prop it up, it sets wonky.
Not a happy bunny and had to think of a different way.
This is me a little further down the line. What i've decided to do instead is glue with Zap-A-Gap superglue then smear Araldite on the inside join to strengthen it. Maybe some Green Stuff as well just to be sure.