Picking up this ***More Pics Added***

I'd be very concerned about the modifications made to get those windows in and whether the walls have enough stability left. Im also worried those windows are not very waterproof, so perhaps new skins to return to the original window size. Installing original format cabinets will need to be done with the skins off from outside in to get a secure connection. No doubt original rot is there in the sills and floor as this does not seem like a professional job. This is going to be a ton of work...

Just a few thoughts as I enjoy my morning coffee:

Since it was used by the school I assume it is/was inspected and approved for use as a concession trailer by your local health department? If so does the approval transfer to the succession of new owners? The reason I ask is that in our area, obtaining such approval is no small matter. You may find that the trailer, repaired and spruced up for continued use as a concession trailer, will be an easier and less expensive project that in the end is also more valuable.

If you don't want to become a concessionaire, consider the project an investment in your vintage trailer restoration education. Sell the trailer and use the proceeds to fund another trailer project that at least is fully intact with all its original parts.

Yours and my tradesman experience sound very similar. You'd think a small little box would be a quick easy project, but there are so many little details and the time it takes to learn and understand the process and do a respectable job will surprise you. In remodeling the joke is that projects always take twice as long and cost twice as much as you originally budget. Ditto that for these old trailers.

You say you have three boys participating in travel sports? So did I. I assume you work full time? So did I. Where are you going to find the time? I had a son in soccer and a daughter in lacrosse. During those years I couldn't even keep up with my property maintenance let alone make any progress on all the projects I had stacked up. And then there's keeping SWMBO content.

Don't get me wrong here, I'm not at all criticizing your desire for this project. Not that you are concerned with the ramblings of a complete stranger on the internet. Believe me I totally understand that there are some things we just can't resist and are determined to take on. I have the same affliction. Either way I promise to be among your biggest supporters and give you as much help as I can, from my keyboard that is.

So after going back and forth with the owner, this was a deal I just couldn't pass up......although I am new to the vintage market, so I may be way off base on the "Good Deal" end of it. Ended up paying $250. It looks like I will be resealing most the windows and re-framing the lower portion of areas. On the bright side, the ceiling/roof looks to be leak free and in good shape. Here are some pics of the current interior as well as a initial remodel floor-plan that I drew after taking some measurements. It is very similar to the original layout. Feel free to let me know your thoughts.
Current Interior:




Initial Floor-plan Drawing. I will be looking to see if I can put the clear and gray water tanks underneath to give more interior storage room/flexibility: