bunk beds

Hi planning on building a bunk bed/ playhouse for my kids. Will hopefully be a fair size with a length of 2M and a height of 1.5m. Going to incorporate a slide to the side and have a set of stairs to the other side. The top and bottom floor will have a frame so that both mattresses are sat lower...

I've got a set of pine bunks in the usual 'natural' effect. They do have a lacquered finish but it's matte rather than gloss. They are looking at bit dated and boring, but are solid and too good to simply replace with new. I'm thinking about giving them a spray paint makeover and looking for...