I agree with the above comments, over the years I have been in your situation several times. You hit the bottom and decide "enough is enough", I have also done what you are considering however with age comes experience and I quickly realised that it is never wise to act on impulse without giving yourself breathing space.
Many times I have simply closed the garage door walked away and taken time out only to find when I return that what seemed impossible was, in the cold light of day fixable. If possible take time out, do a bit of research on Google etc. Is there any members of your local MVT group you could ask for advice ? I have made many friends in my local group and their advice over the years has been invaluable. As my old mum used to say " These things are sent to try us ". Good luck and stay positive, you obviously have a vehicle people want, you just have to sort the problems and it will sell.