To the OP, BearFootBowman.
If you haven't already got the gear and started, order a laminated blank from Boyds in the US and go from there. It will cost you as much (or less) than a sheet of structural ply and glue from Bunnings. It will be easier on your tools and much easier to work accurately than glues together bits of ply. End product will be much better all 'round.
From memory Boydes blanks will cost about $100 with postage ($45 for blank). Structural ply will be about $70 for a sheet, plus glue, plus too much time working with inappropriate material, plus time sharpening tools all the time because the glues aren't made to be worked like that......
You get the picture.
Good luck with the project!
Cheers
edit: just checked date of OP... probably too late for any advise now.