Assuming a swing-wing design, I would say the VF-1 wouldn't look too much different if designed today. Maybe 3-D vectoring nozzles and less right angles to reduce radar signature, but I think it would still look more or less blocky like the F-22 and JSF. The VF-0 was a technology test-bed, while the VF-1 was mass-produced mecha whose airframe likely wasn't optimized for aerospace maneuverability (raw power from the reaction engines would compensate a lot). Rather, it seems more fitting that it would be designed for economy, ease of repair, and maximum compatability with add-ons (fastpacks, boosters, etc).