As for Hawaii, the law states intends to manufacture. In my world and legally, if I do not purchase the parts with the purpose to manufacture a firearm, I can have all the parts and pieces I want and there is nothing they can do or say about it. The have to prove intent. I stand on my Hillary Clinton email server defense where she didn't intend to break the law when she signed and acknowledged that she wouldn't.
SECTION 3. Chapter 134, Hawaii Revised Statutes, is amended by adding a new section to part I to be appropriately designated and to read as follows:
"§134- Manufacturing, purchasing, or obtaining firearm parts to assemble a firearm having no serial number; penalty. (a) A person who is not licensed to manufacture a firearm under section 134-31, or who is not a dealer licensed by the United States Department of Justice, shall not, for the purpose of assembling a firearm, purchase, produce with a three-dimensional printer, or otherwise obtain separately, or as part of a kit:
(1) A firearm receiver that is not imprinted with a serial number registered with a federally licensed manufacturer;
(2) A firearm receiver that has not been provided a serial number that may be registered in accordance with section 134-3(c); or
(3) Any combination of parts from which a firearm having no serial number may be readily assembled; provided that the parts do not have the capacity to function as a firearm unless assembled.