[Stevo69]

I am looking for advise on what type of plywood to use for the Dobsonian project. I am using Kreiges Dobsonian book as a guide. I am aiming for 5/8 plywood but I've notice place like Bunnings and other general hardware stores stock a pretty course plywood. And most are twisted or have some sort of "warp" in them.

Should I look at a "marine" grade ply? Any hints or tips

I am in Melbourne (North-West) if anyone can recommend a supplier, I will travel across Melbourne if I have to.

The other option was to build the mirror box and mount out of, say 12mm MDF and "laminate" a fine sheet of 5mm plywood on top to get the "grain effect" on the outside.