West harbour marina =
Westpark Marina. It's probably the handiest to Lynfield, and there are the type of small industrial units with attached accommodation that you have in mind within reasonable travelling distance also.
Westpark does have some dredging issues, although berths in the size you want are not much affected by this. The approach channel is well marked, with adequate water except at the upper end at low tide. You might not be able to use the channel at low tide, but shouldn't have a problem otherwise. Some people have told me that there is barely a meter in the last few hundred metres of the channel at low tide, but I've been using it for eleven years and never found less than 2 meters,
as long as I stayed in the middle of the channel.
Your vessel would fit a 16m berth here; all the berths are longer than their nominal lengths, e.g. my own 14m berth is actually 15.2m - I've measured it. Likewise with beam; the nominal maximum beam for a 16m berth is 4.35m, but the actual width is almost 2 pontoons - 3m. The power cat in the 16m berth across the pier from me is a bit over 5m and fits in ok.
Note that the marina is currently up-grading the power supply to the piers. G-pier, where the 16m berths are, has had the work completed, so all berths now have a dedicated power outlet. (Wasn't the case previously.)
Have checked with the marina office, and they have no 16m berths currently for rent and a waiting list for them. This would mean having to buy one, though berths here are very cheap. The marina has 6 x 16m berths for sale through their office, at $NZ 30,000, 29,000, 26,000, 25,000, 24,000 and - wait for it! 12,000. Asking prices are set by the current berth-holders, which sort of explains the disparity - the $12,000 one is in the middle section of the pier, so I assume the owner must
really want to sell. I haven't checked on "TradeMe" or elsewhere, but there may well be others offered for private sale, i.e. not through the company.
Now the nasty bits: the annual OPEX (OPerating EXpense - "bodycorp" equivalent) for a 16m berth is $NZ 7390.67. It costs slightly more to pay monthly; $662.08. If you buy privately the vendor must pay the transfer fee of 2 1/2% of the purchase price. Buying through the marina company is the same with the addition of another 2 1/2% commission which also (as far as I can ascertain) must be paid by the vendor.
A wild card: there are two end-of-pier double berths for sale. These run across the outer ends of the piers, and can be used either as two berths or one extra long one. These berths certainly have no draught problems, and are very easy to get into. The one on the end of G-pier is 32m - an 18m and a 14m. It's offered at - gasp - $NZ 180,00. With your bowsprit run in you could berth in the 18 m end and rent out the other. Not positive about the OPEX for the whole shebang but it would be in the region of $NZ 16,00 per annum. The other one is on the end of E-pier; 22m or a 12m and a 14m. Asking price is $NZ 70,000, and I'm not sure what total OPEX is, but it would be in proportion.
Hope the above is of some help.
John (Not B

)