Firefly,

Making a full cap template is SUPER easy.

All you have to do is put plastic wrap on your head and start taping it down. Once you get a basic shell, take it off your head and start cutting it roughly to shape. Place it back on your head and mark any areas that need more cutting and note any areas where it needs more tape. Keep cutting off material and adding more tape until you are satisfied.

Alternately, you can order an all lace piece by measurements and if the hairline and temples need to be shaped you can cut the base and pluck hairs to get it the way you want it. The only downside to this is that it can compromise some of the realism in these areas if they were ventilated nicely at the factory. I don't usually expose hairline so it isn't much of an issue, but if you are exposing a full hairline you want it to look as good as possible.

If you want to build a template you can email me pics when you get it finished and I can give you pointers to help polish it up.