Porsche 914 rack info

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I'm collecting parts for my build and managed to get a Porsche rack rather cheap.
So, does anyone have any info regarding mods/ fitting of this rack to the Terrapin.
Also, one of the newsletters posted on here mentions that 3/4" tube can be used instead of
7/8" for the main rails. Is this correct, so I just need to use 3/4" all round?

Lastly, by the look of the plans, Allan gives the correct pick up points on the chassis for the suspension. Why then do is it said we NEED the string computer? Is this only if we use different wheel tyre combos?

Thanks for any help.

[MiNiTiCi]

Fred - "Jawfish" on this forum used a 911 steering rack on his Terrapin build.

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Thanks Minitici, hoping he might see this.