I'm taking a process from my other hobby group, but it should work just as good here. We make shields with this process, and it works great!
Since you want to end up with 3/4" plywood, you'll be best off building up 3 layers of 1/4". Cut the panel width about 3-4 inches wider than needed.
Take 2-3 pieces of 2x6 or 2x8 or 2x10 <the width is dependant on the depth of the curve you want- buy your lumber accordingly> the length of the panel you need to bend.
Cut the same curve into the lumber that you want the panel to match.
Nail<nailing works better than clamping for this> the first 1/4" panel to the convex side of the 2 lumber pieces<one on either edge of the panel, and one in the middle if they are particularly wide pieces>.
Slather the entire surface with wood glue and lay the next sheet of 1/4" and fasten. Then repeat for the last sheet. Make sure you nail or clamp everything good and tight to the "press". Let everything dry and voila! 3/4" custom curved plywood.
Just cut off the excess width <which removes the nail holes and you're golden!
Hope this helps, I can do up some pics of needed.
Xar256:D