Going through divorce, please help me, any idea of value?

That sucks to the extreme.
I'm still in WTF mode after a year has gone by. Sort of same story, but I was stuck in NOLA fixing up the flooded house, while she was set up nicely in Knoxville Tn living the good life. After she spent what little insurance money we received, burned through the savings, and racked up all the credit cards. I found out she has a boy friend. I'm still in NOLA after Uncle Sam forced me to retire just 90 days after Katrina flooded the house. Yes, FIVE FREAKING years later, still working on it.

Bright side for you, YOUR STILL YOUNG! And don't give in and give up or reduce the 50/50 custody like my ex tried to do in court.
Try being almost 50 back out on the dating scene. Don't know what to do after being married for the last 20 years.
The only good thing for me so far, didn't have a classic until about 6 months ago. Impulse bought a 62 Lancer just like I had for my first car. Keeps me from going "postal". lol.

Get written estimates for what dealers would give you in a trade in.
Then get written estimates for all the repairs that need to be done.
That should drop the value down to the bare minimum .
Did you apply for VA disability, hopefully not, so do it now and get a little break on your tax burden.
GOOD LUCK, and Semper FI!