You could use either Sand and Seal or Eze Kote inside the boat. The Eze Kote is a resin which will give better waterproofing and protection.
On the exterior you will need Sand & Seal to allow the above water woodwork colour and grain to show through.
As far as external painting is concerned, the Ronseal will be OK for the varnished above waterline wood finish but it would not be advisable to spray car paint over it for the underwater hull.
You can mask off the above waterline hull and use the car spray over the Sand and Seal and then put Ronseal over that though. (but not car spray over Ronseal).
According to the bottle, Sand and Seal will accept just about any type of paint so you could use enamel for the underwater hull if you wanted.
The above will work, but others on here may have equally valid suggestions.
One thing we all agree on is that before applying finishes to the boat, make up a test piece from surplus wood to check that it will work out OK and look the way you want it. There is nothing so discouraging as having to strip back bubbly paintwork because of incompatible finishes.
I see the Victoria has white waterline strip. Something like this can be difficult to mask off and paint neatly and a good alternative is to use Trimline Self Adhesive Vinyl tape which is waterproof. It is widely available, for example:
https://www.cornwallmodelboats.co.uk/acatalog/trimline.html
There are a lot of glazed windows on the model. Use Canopy Glue to attach the glazing, never, ever, superglue which will fog it.
There is a feature article on building Aeronaut boats including Victoria on here which you may have seen and mentions the propshaft etc. Also note the comments about not getting glue on the surfaces you want to varnish. I would use Deluxe SuperPhatic or Aliphatic which allow any excess to be wiped away with a damp cloth before it dries.
Andy goes Aeronaut!
Colin