There is two ways of looking at this, sentiment v's hard cash. To get the Exmo through am IVA is going to mean stripping it back down and taking photos as it is rebuilt,which is fine but if you are paying some-one to do this it is going to cost a fortune. At the end of the day when you get the car through the test, what is it actually worth, I paid £2800 for mine last year, taxed and on the road. The other alternatives are to sell it as a unfinished project or as individual items the latter being to most likely to raise the most money as parts are getting hard to get hold of.
It is going to be a hard decision but if it were me I would sell the bits and buy a complete car and then put my stamp on it.