George, if you Goggle S Cal. area you will find dealers to do remodeling work for you.
If you have owned or own a home its not much different than doing some upgrades yourself and save some big bucks. The QUICK TIPS LINK below will bring you to QT's in Newmar forum where myself and many members have done upgrades to their coach's to make them more livable and a place like home.
When you replace the floor you have to consider your slide if you have one and how the slide will travel over the floor. The floor will have to be cleaned before you bring in slide or sand ect. will be embedded into the floor.
Which ever you decide plenty of help here to help you even the Vintage Forum above may give you some ideas.