how hard is it to custom make mtr mounts and tranny mounts and headers.

If you have to ask, it's too hard
It depends on your ability and resourses.

i know how to weld. have taken a few classes at the jc cuz im in jc anyway i have the tools and some skill. i want to put a ls1 t56 in the camaro and i dont want to pay mega bucks for the mounts and headers.

yeah it all really comes down to your skill level and equipment.

they make dyi header kits look in summit as for the motor and tranny mounts use you own ingenuity

Headers might not be too difficult if you can bend pipes, or have them bent for you. You could use a header gasket as a template for the flanges.