Length of the boat, while not all together irrelevant, is hardly the most important variable in deciding where or even if one might locate a forestaysail. "J", the distance from the bottom of the jibstay back to the mast, really matters more. And all this is assuming without evidence that yours is a masthead rig. A 3/4 rig is most unlikely to ever sport a forestaysail but 7/8ths rigs with a forestaysail inside the jib are not unknown.
What makes you think you need a forestaysail? Are you really after a way to set up a snugger rig for heavy weather, or what?
It would be fun to speculate on a forestaysail if we had detailed information on the boat, like a sail plan and hull profile at the minimum. Best have a consult with a qualified NA, sailmaker or rigger who can look the boat over and pick your brain a bit.
G'luck
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