As 3GE says,
There is a lot to getting the suspension geometry right and you'll need to draw it out on a suspension design program to understand exactly whats going on especially with regards to the geometry designed into the MX-5 uprights.
You won't be able to use wishbone lengths the same as the MX-5 ones as they're totally unsuitable for the Haynes roadster.
I would put the haynes design into a suspension design program to see how it works then replace the sierra upright with the mazda one to see how it changes Akkerman, TOOT, and caster. The steering rack will need mods to bring bump steer to an acceptable level. (some is desirable for stability under heavy braking).
Or you could cheat......Find a MX-5 based westfield and get your tape measure out!!!
BV.
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