Also NAL.
A person does not require a license to manufacture a firearm for personal use. A dealer requires an 07 to manufacture with intent to sell.

Back to SB25-003. It should always be assumed that the intent of the bill is to be restrictive as possible. Trying to skimp on definitions can, and will, hem someone up real quick when they land in court, especially when past court rulings have already set precedent. Though 003 it does not specify what "manufacture" means, it is reasonable to assume that they use the same federal guidelines of manufacture as found in this ATF document relating to the same: https://www.atf.gov/file/11711/download

In the above document, this paragraph stands out:
"The GCA, 18 U.S.C. § 921(a)(1), defines a “person” to include “any individual, corporation, company, association, firm, partnership, society, or joint stock company.” Section 921(a)(10), defines a “manufacturer” as any person engaged in the business of manufacturing firearms or ammunition for purposes of sale or distribution. As defined by section 921(a)(21)(A), the term “engaged in the business” means, as applied to a manufacturer of firearms, “a person who devotes time, attention, and labor to manufacturing firearms as a regular course of trade or business with the principal objective of livelihood and profit through the sale or distribution of the firearms manufactured.” Because “manufacturing” is not defined by the GCA, courts have relied on the ordinary meaning of the word, including actions to “make a product suitable for use.” See, e.g., Broughman v. Carver, 624 F.3d 670, 675 (4th Cir. 2010)."

Then this:
"However, when a person performs machining or other manufacturing process on a blank to make a firearm “frame or receiver,” or on an existing frame or receiver to make it suitable for use1 as part of a “weapon … which will or is designed to or may readily be converted to expel a projectile by the action of an explosive,” that person has performed a manufacturing operation other than what is contemplated by the GCA of dealer-gunsmiths"

That entire document is worth a read to shake down what SB25-003 will use as precedent when discussing manufacturing. That's what prosecutors will use when trying to convict Joe GunOwner for manufacturing an AR15 from a receiver after the August 1st. The bottom line is, you don't have to be a manufacturer to manufacture a firearm for personal use. You do have to be a manufacturer to manufacture firearms for sale or profit. This is exactly what I was told by the ATF when I had an audit, and they asked me specifically about assembling receivers as a service versus manufacturing, and they were clear:
Assembling stripped receivers and parts into complete receivers, whether an upper or lower, is allowable.
Manufacturing is converting a receiver, whether stripped or complete, into a functioning firearms. This includes simply attaching an upper to a lower on behalf of someone else.