It Depends on your RV body, auto electric, mechanical, plumbing and RV appliance troubleshooting and repair/replacement skills, work space available, and time from start to completion/camping touring ready status, and most of all total cost. Bear in mind that an old Class C's market value will not be more than $5000, regardless of how much money you spend on it. Buyers can't get loans on old Class C's. Old class C's usually need to have radial tire wheels and tires installed, can't get 800x16.5 bias belted tires. Tires need to be changed every 5 or 6 years. You might be better off selling the rig for whatever you can get and consider buying a camping/touring ready motorhome if you and your family really want one and will use it frequently. (Don't ask how I learned this.)