Joel, Hard question to answer right now, as I still need to finish testing things before I will know waht all it is going to take. but the minimum would be the storm lake barrel and a comp along with the mag well and mag extensions from Kenny. The springs seem to be the hard part, there need to be a fine balance here.
I just recently put a C-more STS on mine to see if that is going to hold up well to permently replace my Jpoint. The STS looks a heck of a lot nicer.
I am about to start in on one made from a 9L for my wife to shoot next year in open, So I should have a better Idea of const on a 9L in a couple months. After doing some weighing and measureing I am starting to think the 9L is a better starting point as the slide will be easier to lighten (which will mean cheaper to do for a customer).
hope this helps a little.
Dan