Yes of course.
We recommend you are there or certainly your kitchen fitter, as there are often details that we need to ask or discuss.
All the base units need to be in place and level and secure, and sink, taps, hob etc need to be available.
Yes, we will ensure your sink are fixed and secure ready for your plumber.
Unfortunately no, as this is a job for a qualified plumber or electrician.
NO, this need to be done before templating
We advise that you do, and you are more than welcome to choice your unique slab.
We can give you an indication, but we will need a plan of the kitchen for an exact price.