Use late model STI front, lower control arms?

[fateo66]

The thing that everyone seems to keep missing about the 818 front suspension is it's no longer MacPherson - all the caster tricks for the WRX arms are moot when you can infinitely adjust the upper arm. You can dial in a TON of caster without ever having to move the lower arm. Also, if you use 05 STI lower arms those have the most caster out of them all FWIK.

I disagree, if you only take caster out of the top the tire will move closer towards the center of the car and since we already know their is clearance issues with the tire hitting the firewall Imo builders should do everything they can to add caster via the lower control arm in order to clear bigger tires.

Edit: and 04-06 USDM STI arms are the exact same. Its the JDM and 07 US arms that are lacking the extra caster.

[Scargo]

The upper adjustment has not escaped me either. It is (to me), a given; part of the equation where there are a myriad of elements and options.
There is the adjustment on top and there is the fact that I am getting a bare frame that I have no reservations about modifying.
I am building a race car. I am TIG proficient and I can hack out parts in my garage-shop or have pieces made with laser precision. I am feeling inconvenienced by the fact that I no longer have machining centers to do my bidding.
I am hearing that '07 has less caster. Is that because of the arm or the brackets? All this reminds me of inflation: Relative to what?
I think I read that '08 and up arms increased caster (over GDs), and that in '11 they increased caster more and changed other geometry for the good (performance-wise). That was why I upgraded my '08 LCAs to '11 LCAs.

So, back to my original question of "how do the GD arms compare to the GRs?". If I used space available, and not cut any of the framework out, would I potentially move the wheel forward substantially and gain more clearance in the inner rear wheel well area? Would I possibly be increasing my stance? I will be pushing the boundaries on tire sizes relative to what's gone before.
I am just doing this guessing game because I don't have my kit and I don't have any dimensions from GD LCAs. I sure would like to know how the geometries compare.