Even if I have an all 3 walls glass and just the roof will be some kind of waterproof material we are thinking sandwich panels. And one more thing these windows are facing the sun at noon. Do you still think it will be dark. I am worried that I am not making the right decision but at the same time I want to have more space in the house. What do you think If I keep the current kitchen and the extension for the family room.

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Oh that's weird, the post looked old. It's a little hard to say to much without seeing the whole space / project but in term's of materials you should be looking at MR MDF (MR stands for moisture resistant). I used to do lots of bespoke work as www.exploitspace.com but have moved away from that. I think the point I was making is that you need to be using prefaced and edged MR MDF and given how the materials market has changed it shouldn't be hard to find a find somebody who could do this at a reasonable price. I get my pre-cut and edged MR MDF from https://cworkshop.co.uk/ but you will need a design as somebody to assemble it for you. last time I was collecting some materiel i got talking to another customer called https://www.bournebespoke.com/ he may be able to help. I may also be able to help but I would need to be able to give the project a very quick assessment. Jon

Your problem is leaks over time when the grout and adhesive shift around. If the levels are as off as they look, you need to apply waterproof plasterboard prior to doing the tiling. Sorry but you are better to do that before going further.