I like your style. Those look like some high dollar windows, plus the emergency egress.... well, that's priceless. So hell yes, there's about 500.00 that can be spent elsewhere. I'm tellin ya', most of my build was done just like that. From the trailer, WFCO power center, RV Fridge, Wet bath combo, 125av deep cycle, cabinets and doors, generator and rooftop 13500btu AC/heater, propane catalytic heater, Wool Rug and some other stuff. About 20-25% of retail. I'm right at 3500.00 including the trailer, and just installed a new 10 x 8 awning. I did opt for new freshwater tank and Black tank....Just couldn't fathom the thought of a used black tank. Plus the odds of finding something that might work for my application were astronomical. That's my story, and I'm stickin' to it. In fact, I believe the black tank was the single largest purchase. Even my Screamin' Eagle Street Glide Harley I bought as a "distressed property". Long story, but suffice it to say Don't cheat on your wife with the babysitter.. or anyone else. just sayin'...
If you're not under some unrealistic timeline and keep your eyes and ears open for an opportunity, and have cash, Cash is King, you can have something real nice in a year or two. And let's keep in mind that anything with wheels is not a good investment or store for your wealth. I love toys, God knows I do. I currently have 9 registered vehicles, but they are not a good retirement plan. Unless you plan to live in them. I had several friends that worked in the Bakken oil field and they made some good money. And they had houses, and 75,000 dollar toy haulers, and 50,000 dollar Harleys and 90,000 dollar trucks, and to a man, every one of them is divorced, ass broke and bitter, pathetic middle aged losers since the oil boom went bust. They didn't have jack squat for savings and now it's all gone, and the they are still paying for crap they don't have any more.
Head shake, face palm, sigh....ugh.
On the bright side, I still have all my stuff and it's all still paid for. ...

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Pride goeth before the fall....just sayin'
McDave