Griffond,
1/4'' is not thick enough in my opinion. I would suggest 1/2'' or 5/8'' thick. You have to consider your hook hangers wether it's screw eyes anchored in hardwood dowels like Spoonplugger Gino does or wire thru. For the woods you mentioned, I would use the hardwood dowel method.
I build 9'', 11'' and 13'' drop belly gliders out of hardwoods. If you're looking for a long glide action build a more cylindrical type glider similar to a Manta.
s56