We get asked this question almost every day with no other information than "how much does it cost"
This is an extremely difficult question to answer as it will all come down to the final spec. Do you want a poptop? swivel seat? windows, how many? fully off grid or campsite use only?
The list goes on and on so the most important question is "How much do you want to spend on your campervan conversion"
Answering that question while knowing your budget makes things so much easier as certain things like a poptop as an example can be took out straight away.