I'm a self-employed contractor and this was the biggest job I've done so far. I guess this still counts as DIY since I did it all by myself? (except for the electric)
Oh that's neato bonito! Local laws here require fasteners every few inches/feet for electrical and plumbing. They take the pex and clamp it to the inner wall studs. Any leaks then mean that you have to re-do the wall.