You're technically right in that you would likely have been entitled to penalty wages, but unfortunately it's not quite that simple and having you demand payment of them is unlikely to work.
Recouping penalty wages requires two separate and specific notices, as well as other administrative hoops, and I can't help but assume that you're beyond the point where you could successfully deliver those notices and then assert a successful claim.
Numerous attorneys in the area, myself included, regularly handle non-payment of wage issues on a contingency fee basis. Often, however, an attorney is retained immediately, before the matter proceeds without having crossed your t's and dotted your i's, so to speak. At this point, since you've already gotten your regular wages paid, there's little chance of an attorney stepping into the case for a contingency fee.
You can attempt to proceed on your own via small claims court, but I would be surprised if it is successful. First, I don't know that you'd be able to assert this claim there in any event, and second, I'd be shocked if the employer didn't request a jury trial and thereby remove the case from small claims altogether. Once that occurs, you'd essentially be in the same position you're in now: in need of retaining an attorney to represent you, despite how difficult that may be to do since few, if any, attorneys would take the case at that point on a contingency fee.
If you do proceed in that manner, however, I hope you'll come back and comment here to let the attorney posters know how the case was ultimately resolved.
A bit of a head's up, however: your calculation that penalty wages may be due for only "business days" is incorrect. Once penalty wages are implicated, they accrue at your normal rate for eight hours per day for up to thirty days (business days or otherwise) until the wages due are paid.
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My firm handles late payment claims on a contingency fee basis. We offer free consultation and prefer to sue large companies. Look us up on line.
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I do a lot of wage claims. In my 24 years experience, both in defending and presecuting such claims, such claims are handled on a contingent fee basis. Furthermore, having a lawyer greatly increases the chances of settlement because the one-sided fee recovery provisions of ORS 652.200 make it very risky and expensive for an employer to fight such claims. Penalty wages are "wages" for purposes of entitlement to fees even if all actual wages have been paid.