You will find such a project a fun and rewarding experience---if you choose top-notch experienced craftsmen. Start out with a sound quality gun with good barrels for the basis and have a definite plan. Your project will go smoother and end up exceeding your expectations if you and your chosen craftsmen communicate well together as a team. Be patient. Good luck!
I sincerely appreciate your sharing the info and photos of your custom Fox - what a great project. I hope to hear more from others on the forum about their experiences.
Take Care;