Hi mate, remember you put it for sale in January, lots of people are still recovering from Christmas even now, we are approaching spring/summer so no doubt the interest will start to peak soon.
What kind of reasons or feedback have you got from people who have low-balled you? Are there any simple low cost solutions to any of the feedback that may help when the next interested party comes along?
Would the well respected garage who did all the work consider advertising it for you, storing it and you give them a cut instaed of paying the current storage?
GLWS mate im sure interest will pick up soon