From my understanding, this will vary by dealership. For the one here, if you want a non GT car, should be pretty straight forward and at MSRP. You should be able to do the car configurator, place your deposit and done. Or, if you want to go baller style, you can go to the dealership and do the full on personalized experience and change just about anything on the car you want for money.
For the GT cars (excluding the GT4), you are going to need a relationship with the dealer, money, or both. I have heard of people getting them at MSRP but that just doesn’t sound right unless you have huge status with your dealer. But, possibly if you call around enough also? For here, to get the round one allocation, you had to go 50k over or be a VIP with them or some combination of those two for the first 4 or 5 allocations (not me). For round two, you are some lesser version of the round one people with either less money over MSRP or status (me). Not sure about subsequent rounds but it will probably get to a point down the road where you can order at or close to MSRP. At this point, from what I hear at least, all allocations are spoken for the next 2 years.