[quote="goose"]Can pipes be chased into cinderblocks?"
Yes but you should use soldered joints and protect the buried pipework with densotape before overplastering
"When tiling the floor are floorboards ok or should I put down a board flooring? - if so which one?"
No floorboards are not Ok unless you want to be redoing the job in a short period. I'd use 18mm WPB ply screwed at 300 centres if over the existing boards or 24mm if direct onto joists. Alternatively you could use a thiner ply and a decoupling membrane between the tiles and the board.
"Can the shower tray be fitted straight to floorboards? or as above do I need to fit some board of some kind?"
If it's a stone-resin tray you should mount onto a sand/cement mortar over WPB or birch ply. If it's one of those with adjustable feet then leave out the mortar but still onto ply.
DIY how to tutorial projects and guides - Did you know we have a DIY Projects section? Well, if no, then we certainly do! Within this area of our site have literally hundreds of how-to guides and tutorials that cover a huge range of home improvement tasks. Each page also comes with pictures and a video to make completing those jobs even easier!