When is an Ultra Light not and Can it be a LSA

[Bill Berson]

You should ask specific questions on the forum, instead of "why can't I do this" again and again.
We gave you some options to consider, but we feel it can't be done legally without build documentation.

Of course you can call the FAA. I prefer to research the laws myself. Many times the folks at the FAA are young and can't answer these rare questions. If you are an EAA member you can call EAA for better advice, in my opinion. You can attend a forum at Airventure about registering aircraft.
Know the facts before you buy.
I bought an unfinished kit. I will likely be able to get an airworthiness certificate with documentation I must provide. But I don't expect it to be simple.