Suggest you direct your question to a couple of bathroom specialists or good project plumbers. There are at least three trades you require to do this work (plumber, electrician and tiler) and either you need one organisation to project manage the whole thing for you (at a cost) or you need to contract separately for the trades. Some organisations may be unwilling to contract with you by you supplying the materials; tradesmen make part of their profit through a margin on the parts. The success of such a project is largely in the project management (co-ordination) of the various trades to make it happen quickly (you won't want to be bathroomless for too long). This sounds like about 6 days work. What's a PVC ceiling?