So I have a few questions. I’ve decided on a high roof ford transit extended. Main components, being a bed, I love the idea of a shower, toilet, mini fridge, ac/fans, solar, two crates for animals that either are stacked or become counters, extra seating with seat belts.

How feasible is it to continually build? Like can I start out with just a bed and toilet? And go back and add in the shower like in a couple years.
Would I need to install all the electronic components and the plumbing when the bed gets installed? Can I worry about it when it’s time to install the shower?

I’m sorry about my ramblings. But budget wise I would be able to get a bed and toilet at the very beginning of having the van.