Well...let me give you some hard learned advice, so you don't walk the same land mine field some of us have walked.
First, it will need to be at least a 40 hp powerhead to equal a 25 prop. A 25 Jet will be sorely underpowered. There's NO law in TX about what motor you put on what hull..
A small 2" tunnel to feed water to the jet is huge for performance, what you absolutely do NOT want is any sort of ridge, runner, chine or otherwise running down the middle that disrupts water to your intake. Make DANG sure you can get the motor height right, without adding any setback. Setback will kill a jet hammer dead. Power trim will add a lot to how it runs, being able to adjust makes a big difference.
Ask the boat guys if they've run jets on them, don't be the lab rat...
4"-5" is nothing if you're setup right at all. I can run all day in 2" and make about 80 yards of less than 1" before I finally suck all the water out of the mud. Sorry this picture isn't better, I'll see if I can take another. But..the jet is tucked up into a 2" tunnel, which allows the entire intake to be above the bottom of the hull.