Personally, this isn't a beer that I'd brew. Strawberry is a subtle flavor that I don't think will hold up well at all to a dark beer like a porter. For a porter, use a strong, robust flavored fruit like cherries or raspberries. I think strawberries will be lost on this beer. I think strawberries would be great with a pale lager or a wheat beer, but will be wasted on a maple porter.
Currently On Draft: Bamberger Rauch Dunkel, Belgian Blond, Pilsener Urquell clone, Smoked Porter
Bottled: Concord Pyment, Mi'Apa Sparkling Mead, Chimay Blue, Old Simcoe American Barleywine, Old Cantankerous
Fermenting and Conditioning: Pseudo-Decoction Munich Dunkel, Left Hook Bitter
Recently Kicked Kegs: Fresh Hop Pale Ale, Citra Rye IPA
On Deck: Old Rasputin, Northstar IPA, Ur-bock Dunkel