I am contemplating building another speedster

, I really enjoyed building the one that I have, and fancy another go

. However I built mine years ago and therefore have no idea about IVA

.
Can any one help with the following:-
If I use a pre 72 chassis will the vehicle still be tax exempt ?
Once it has got through IVA can I legally change things like steering wheels, wing mirrors, lighting, seating etc to make it look more authentic ?
Any help would be greatly recieved

. also any advice regarding IVA. ie How scarry is it, what improvements have to be made from the pre SVA/IVA to get the car through ?
regards
Steve