Why not swap the nacelles for the ones the Tiburon uses?
I've thought about doing that for the Chabot Refit on a few occasions, but never got around to it.
I really like the color scheme you have going here. I'd say, don't change a thing on what you've got now.
As for the phasers, unless you decide to swap out the original saucer for the kitbash version, which doesn't have phasers, you're gonna be doing alot of patching before you're able to make the phasers. Or so I would imagine.