Cool - my gut feeling is option 1, but there is something very pleasing visually about option 2, but it's got to be about the sound right? My next build will be a double P in 1 of those two configuations so i look forward egarly to your findings. Just moving the pickups a cm or so really changes the tone, let alone reversing them!
What will the controls be? I was thinking the ultimate would be 60's jazz bass style with stacked volume and tone for each pickup, but you already have 3 post and a switch there...