Be Careful....
My advice, speaking from experience is to proceed cautiously.
What looks like a good deal may not necessarily work out that way in the end. If your keen to buy I suggest you have the project inspected by someone knowledgeable, and preferably someone who has RV or even better an RV4 as they will know what to look for, or lastly someone with metal experience.
Here are some of the things to take into consideration when buying a partially completed project.
What the seller believes is great workmanship may not be aligned to what you think is, or a A&P. (remember I'm speaking from experience)
Don?t assume that there have been no mistakes made during construction. As the RV4 isn?t pre punched, and even though all the major components may look straight, a lot depends on how well the construction jigs were made. A crooked jig = crooked component
You need to know what?s missing from the kit in order to complete the project, as the cost of these parts can be substantial.
FWIW - that project has been for sale for some time now, years IIRC
Proceed cautiously