Hi,
Really feel for you. I know that feeling when a project goes sour and you just work in frustration and anger.
If it is in EU I might be interested. But to be totally honest, you wont get all your money back as it is sounds like a gamble. I have built one myself but my brother is also interested in one and I might build it for him as a present.
First I would want some more details on how many of the joints that have glue in them and the status on the floor joints as those will be tricky to go over.
I first used a modified soldering iron but quickly shifted to one of those lether irons. I can use it in 50% temp and highly recomend it for the thicker fabrics and thougher seems.
Still have hope for you and think you should wait a little bit with the decision. Maybe try with a higher temp iron and really let it take the time you need.
If you decide to sell it you will probobly get more money from someone who could inspect it more and pay a correct price so maybe start there.
/Gustav