A bubble on "Albrecht Field" (if that's the planned name) takes away the patio (left field) experience. Make the new FB facility work, maybe by having a "bump-out". With a 6 foot outfield fence you only have to be about 200' down the line.
The new indoor field doesn't need to be connected for extra convention space but close enough for an across the parking lot five minute back and forth shuttle would be smart.
GF is limited on larger conventions due to number of restaurants.