My opinion.... I wouldn't have cell that differs so significantly from the other cells that they don't make sense in the series. For example. I think a series LLC taxed as a flow through entity makes a lot of sense for real estate. So you have 10 different projects, "ABC Co, Series A" through "ABC Co, Series J." These all would be have similar, separate protection as long as you accounted for them separtately and included the appropriate language in your formation documents. What I wouldn't do is make "ABC Co, Series C" a service-based company and include it in your series that appears to have been intended to hold assets. You mentioned an S Corp Cell as the management company, but I would assume you want to elect all cells to be taxed as pass through entities since you would clearly want the properties to be taxed as pass through entities.
To me I would set up a series LLC for the assets, and a completely separate LLC for the management company. Many lawyers would counsel you to have those two companies have very disimilar names to prevent people from finding them. Be aware that the management company is the one that would be sued as it deals with your counterparties, employees etc., so it makes a lot of sense to make it "appear" unrelated. It will deter some litigation. If you have the Series K cell be your management company then you pretty much tell Lawyers that you have a LOT of assets out there that the company is so tightly woven that it is worth seeing if your books support the asset protection you want and that may make a lawsuit easier to justify in their view. Then they start to poke at your accounting. Don't let your transaction driven arm (the management company) be a cell as it is worth the small fee to make all those transactions outside the series! One of the benefits to the SLLC is that you file one document with the state and can have a lot of separate companies behind the scenes that are not as easy to find.
Hopefully this logic makes some sense. The cell should just own assets (be on the deed and maybe the note) and receive a payments from the management company (not another cell). You will thank me.
One of the benefits of the Series LLC is that assuming you don't elect otherwise you can have these all taxed as though they are "one company," but receive the asset protection provided by the individual "cell." They are in fact 1 company that merely have statutory protection from creditors and various other rights at a series (cell) level.
Make sure when you file your initial formation doc with the State to include the required language that will protect allow you to protect the "cells." Also remember that your formation documents are also good to consider other languague that may deter a litigator looking for assets.