Did that 28 have twin BB or SB? I will agree that the 28 Sonic is too small a boat have a twin setup period. Even the 31 can be with blowers. This is because of the much liked walk rail around the boat, which does take up some cockpit and engine compartment width. I plan to skip the mid 30' range boat, and go directly to a 35-38' Sonic, AT, or Cigarette. In this range boats, the AT and the Sonic, extend the width of the engine compartment out to the edges of the hull, and delete the walkrail around this area. This makes the boat much more mechanic and twin friendly. I would vote for Sonic dropping the 28 Sonic, or at least the twin option on the 28. The boat is too much like the 26 Sonic, and it does not need twins, just a big single. If you want a mid size twin, go for at least the 31ss.
OFS, does your 28 have twin BBC or SBC? How do you like the engine compartment? Your 45 is absolutely beautiful!!