To get the fabric fillet I start at the fillet area. I use Stix-It for this because it's a little more aggresive in its adhesive qualities. Use a cheap acid brush to apply one coat to framework. 'Tack' cloth to framework elsewhere just to keep it generally in place and out of way. I use Stix-It but you could tape it. At the fillet area 'push' Stix-It thru weave via brush and allow to dry. Stix-It isn't paint. Use just enough at the framework/ cloth contact points. 'Burnish' it thru the cloth with brush which helps it dry and stick. Once this is done start pulling fabric and putting Stix-It on cloth/ framewrok contact points opposite fillet. Pull up cloth that was previously tacked down and start pulling to taughten then re-tack. The iron has never come into play. Keep doing this. Make the fillet area as tight as possible by lifting and pulling then re-sticking fabric elsewhere. It will get done. I think it took me 2 hours to cover this 1/6 scale fuselage. Once the fabric is adherant to framework 'hover' (i.e., do not touch) the iron over the fabric to tighten. Don't tighten much because you still have the other side to cover. I like to shrink the fabric a little because it gives a sense of satisfaction that process is working. You could probably wait until other side is done. Other side a little more difficult. Use very sharp blades and be very patient. Once other side finished wrap a dowel with sandpaper to cut the fuzzies in fillet. Sand too much and you'll get more fuzzies! Flat sand paper elsewhere. Put on nitrate dope fullstrength at seams, let dry then sand fuzzies. Repeat as needed but if you put finishing tapes on it isn't neccessary. I hope this makes sense.
edit: P.S.- thanks for comment upon my Gallery. I've got more coming down the pipeline, too!