We have a similar problem in that we really don't like our brickwork in our 1980 built home and have the dark brown window frames. Some people just can't understand why we dislike the bricks and I thought they may grow on me. After 4 years I still can't stand them and can't wait until we can afford to render. If we had a small area like yours I would have got it done long ago. Ours is huge. Don't be tempted to bag the walls. I've seen some shockers, usually people trying to do a cheap 'flip'. As for the windows, my uncle who is a painter & decorator said that as long as the frames are cleaned well they are OK to paint conventionally. The channels will be tricky, but ours need new felts etc. anyway.

The plan looks a nightmare - bedrooms facing the street, a tiny internal bathroom with no window to the outside (is that legal?) and a "lounge" that looks like it was meant to be a third bedroom. If the internal walls are stud and don't support the roof you're in with a chance, but I'd say to do a proper job the cheap option is NOT going to work. I'd put two bedrooms where the current family room and lounge are and extend the bathroom into the boot room to give window access, or scrap the current bathroom altogether and use some of the space in what is now the kitchen for a new one. Keeping the WC separate is a good move. If you make the street side the social side of the house you can open it right out and create a big front porch that's a social spill-over from the kitchen/dining area, creating indoor-outdoor flow. Planting (two or three shade trees and some stands of tall perennials rather than a "green fence" hedge) keeps your front garden private yet inviting and stops your front porch becoming a stage set for the street. Good luck! I think you'll turn this very ordinary house into a much nicer place to live!

Check out this discussion - there are sooooo many options!!! [https://www.houzz.co.nz/discussions/have-you-remodeled-a-fireplace-lets-see-it-dsvw-vd~790201[(https://www.houzz.co.nz/discussions/have-you-remodeled-a-fireplace-lets-see-it-dsvw-vd~790201) Here are our before .....

This is what the brick looks like