I would like to replace 2 of the non opening ports but spent hours looking on the net but can't find the size. Does anyone know where I can get opening portlights 900x200 (approximately)?

Hi Sailorsilas, can you tell what brand the ones in the boat are? are they from a manufacturer or custom made? Are they acrylic lens's? if so these can usually be recut and replaced using your existing frames. Post a few pics with close ups inside and out if you can, that might help.

Hi 2bish, the ones I have are acrylic without frames. Stuck on. It's possible that the boat originally had framed ports, but they are long gone!

I couldn't see anything that long in opening ports available. I seem to remember that there's a company that does custom windows for boats, maybe in Brisbane? I'll have a look and see if I've bookmarked there website.

Yep, found them. Brisbane and Melbourne: www.alfab.com.au/marine-products/boat-windows/