Pricing based on groups of products

[Azrael]

I have a client who wants to sell kit set guitars online.

Available will be preselected kits with all of the components chosen for the client OR the buyer can pick and choose individual parts to build their own guitar kit.

Each guitar component has multiple possible choices, i.e. different woods for the same part, which the buyer should be able to choose.

So far not too complicated, but I need to be able to change the pricing, if the buyer purchases all the components that make up 1 kitset.

Example
Headstock = $1
Fret Board = $1
Front = $1
back= $1
Sides = $1

Total of individual components $5 but once the buyer orders the correct number of components the total price should drop to $4, for a full kit set.

How do I achieve this?

Cheers

[kobra]

I suspect that this is a unique product
Just price it at $4.00 and make all the attributes selectable "required"