It is nice to have another Plumber on the Forum. Much of our plumbing history came from the UK (like Sir Thomas Crapper) and our orginization "Plumbing Heating, Cooling Contractors" uses an apprentice text book written by a former Britt.
My answers are based on the Kentucky Plumbing Code and will vary with other codes at times; its not a professional jelousy thing, its just the code I have lived with and taught to many others.
Choose the Jacuzzi you want, get the spec. sheet and complete instructions from the dealer (They can copy it for you), read both throughly and check the piping and space you have to make sure it will fit. Even if you hire a professional plumber to do the job you will probably find him reading the instructions before the job is over.