Stuffing 17s under my '69

[4doora]

Hello everyone, this is my first post on GL.net
I've just started working on a 1969 Beetle. I love the German look, and that's how I plan to do it up. Obviously to get the desired look I need a lowered suspension and big rims...
I bought a 3" narrowed/ adjustable beam for the front. I'm going to run ghia disks up front. I also have a beautiful set of 17x7 rims in my garage.

The lug pattern is 4x100, so I'll have to run adapters. I really have my heart set on these rims, but I know they wont fit without some ingenuity.
I plan to make the adapters which will double as spacers, but could anyone point me in the direction as to how wide my spacers will need to be?
Is there anyone else with a similar set up?
It's kind of like a father/son project, but my dad doesn't seem to get "the look", and is really pessimistic about running these wheels on a bug. I know I've seen people run 17x7" wide rims, and even wider, but they're just doesn't seem to be enough space under that little bug fender.

Any help on the matter would be extremely appriciated