Steve ,
Building my Harrison has been extremely easy and although i live in SA i have called Warwick a few times for info and he has gone well out of his way to help . The diff that he supplied to me when i got the kit was faulty and when i asked about it he sent me a new one the next day so if you want my opinion Harrison is the only way to go . You dont need to make up any inner guards or any other panel for that matter it is all done at the factory. As you can see in my gallery i have opted to line everything with alluminium for looks but you dont need to do this as there is fibreglass panels there . The CR has a fibreglass cockpit where the Harrison is Alluminim and steel so when you look from underneath its all shiny
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A few weeks ago Mando came up nad looked at my Harrison and was extremely impresed with the whole package .
Interior is as everyone has said totaly up to you and your budget you could do it cheap for a few grand or go nuts and spend 15g easy . I am currently doing mine now so i will post some pics in a week or so , But so far it will be about 5g hopefully it looks good in the car . Ideas in the head dont always look good in the flesh .
Paul