i'm not sure that is within my skill set. I guess it depends on how complicated the fly design is. Most flys have a lot of panels sewn on curves with tight angles and i may not be good enough for that.
However, tarps, bug bivys, packs and especially quilts, thats what i'm about.
If you had some pics you could email tmarshall charterinternet com and i could have a look and see, but i think it might be out of my league.