I just sold my little 6x14 converted toy hauler and bought a 7x24 v-nose my self. I love it so far. We took it on a 600 mile trip last weekend and it did great. I've still got a lot of work to do on mine though. Plastic mart is VERY expensive on holding tanks.. My advice is to look on ebay and buy Poly tanks for your grey and black water.. You can get two 36 gallon tanks shipped to your door for around 150.. Half the cost of one tank from most stores.. Same goes for freshwater tanks-30-and 40 gallon tanks cost around 50 bucks on ebay.. Adventure RV is a pretty good place to buy RV appliances like hotwater heaters. I lucked up and got a brand new 20,000 btu RV furnace off ebay for 350. Shop around and you can get good deals.
Dealers are all different and the more custom stuff you add the longer it tends to take.. Mine only took two weeks to have built, but I didn't add to much to it.. I learned on my first one your better off just doing the custom stuff your self..