Holden 6 - Unique setup question.

I have a bit of a unique question here. I'm building up an old Torana with a 6 cyl red motor and the plan is to supercharge it with a rootes blower. However, I am currently running triple SU's at the moment and would like to have it set up with a blow through setup on the triples. There are a few reasons for this:

1) Each carby feeds 2 cylinders and having them balanced means you get perfectly even distribution of fuel/air across all cylinders.
2) It would look damn cool.
3) Never seen it done before.

The main concern here is I've never seen it done before and aside from the bitch of a tuning job, I'm wondering if there is a reason it hasnt been done before. Also how would I go about ensuring even pressure and air volume to all 3 carbies? On N/A its fine cause they all draw from the atmosphere. Would something as simple as plumbing it into a plenum first do the job?

Now I know this is not the most ideal setup and I know injection is better and a lot of other things are simpler, however I want to do something different and a little out of the ordinary and I love old school mechanical stuff over all the computer controlled crap of today. I'm aiming for a balance between style and performance.