hi there
What is the plywood going to be used for? Because, some of the plywoods we can get from timber yards are only made up of 3 veneers - and only have a good quality 'outer veneer'. The inner veneer is of a lower quality material which, sometimes is full of voids/gaps. When cutting it tends to either splinter or split. You may find also that the outer veneer peels off the inner veneer quite easily whilst working with it. If it is going to be used for any structures that require no splitting; it may pay you to try and look for 5-layer ply. Although it is a lot more expensive, you will find it definitely gives a better finish and is certainly a better material to work with.
I used a 5-layer ply for the frame build for the 63 foot whaleback from Mantua Model Company and this is their website
www.mantuamodel.co.uk this was 1/8 inch thick ply, but, it was extremely expensive - well worth it though - 3 foot x 1 foot costing 9 pounds sterling, plus postage & packing. Mind you, it is one of the best ply woods I have worked with. I could cut extremely thin sections without it splitting across and the veneers lifting off.
aye
john e
bluebird