Hi there. Good to hear from old Tassie. I used to live in Melbourne and went to Tas quite often. Great place.
We have a BR17 with a spray hood. We sail on the river Fal in Cornwall and off the coast here. We don't sail in heavy weather but up to max force 4ish, with full ballast, the boat sails pretty dry. Spray kicked up will get you if the spray hood is down and you sit on the side seats by the centre board but we've never had "buckets of water" in the face. No doubt you would get wetter in a stronger breeze, especially if you sail without ballast and the boat moves about in a chop.
What we have noticed is that you get and annoying "slop" up the centre board case in a chop. Not a big deal for me (I'm usually helming) but my crew doesn't like wet feet. Last year we fitted a "slot cover" which is two bits of fibe glass sheeting (as used in the outboard well) under the centre board case top, slightly overlapped. Picture is attached. This has helped but this year I'm going to make up some different length bits of timber to drop into the top of the box as well.
If you do go for the spray dodger, make sure the track is attached at the inboard end adjacent to the mast with bolts rather than screws. Ours originally had screws and they pulled out because there was no backing to the deck ply.
I would also suggest that you fit the double topping lift as described in this forum if you have a dodger. Not only will it make sail handling easier but it can hold the yard and the boom well above the top of the dodger if you want to moor somewhere with the dodger up. Otherwise, if the yard is supported on the mast rest at the stern, the boom on ours touches the top of the dodger and you have to lift the boom and the yard to raise and lower the dodger. The topping lift is our improvement for this year.
Good luck, hope you enjoy the BR17 as much as we do. Chris