bon dia,
I suggest you get the drawings from Cobra Restorers as most of us did.
they sell for USD200 and are a bit hidden on their site. They do not sell suspension drawings as far as I know.
but nevertheless I recommend to buy a chassis, rather than to copy the original one. It's quite a lot of work.
I get all the needed brackets laser cut over here in South-Africa. If you want ot cut them with a band saw you need weeks just do do that.
depending on your labour cost it may, however, be worth it.
http://www.cobrarestorers.com/
ceers,
dominik