I have to say that i hadn't actually looked into the chassis plates that much as i assumed they'd be difficult to make, but after your post i immediately went outside and got my build book and i do have to say that they dont look that hard to make. I'll be ringing up my steel supplier on monday morning to get a quote for the 40x3mm flat bar to start me off.
I've just worked out that i'll need 3.404m of 40x3mm flat bar to do the following bits:
CP1 x 2
CP2 x 2
CP8 x 2
CP9 x 2
CP12 x 1
CP13 x 1
CP15 x 2
CP18 x 4
CP21 x 1
CP22 x 2
CP23 x 4
Front Suspension Jig (Lower)
That should keep me busy for a while