New HEXOS build - planning on changing the setup and need some help

[VonAtlas]

WHERE I AM:
I'm currently running HexOS on a standard PC build using older parts -
Ryzen 3700x

Nvidia 1660 Super

32gb DDR4 3200 RAM

5 4TB HDDs (storage) and small nvme for OS

HOW I USE IT CURRENTLY:

I use the HexOS machine in the garage to stream movies, music, store and view photos, and store old work documents. The machine runs 24/7 because I use them to access music from pretty much all over the house, and the family streams at random times in the day across the house, especially as we start cutting off streaming services.

WHY I WANT TO CHANGE THE SETUP:

I have two primary reasons for wanting to change things around:
1) Over the course of about a year, I've had two separate failures in the pool - certain drives degraded and became unrecoverable within about 6 months of use (one in the first 6 months, another within the past month), and breaking down the standard PC case to identify the drive and remove it is a pain in the neck - I recognize that I should be printing the drive ID on the hdd (now) but I'm thinking of changing over to a hot-swap format with rack mounted servers with some cheap server computers I've found locally.

2) I want to start experimenting more with home lab projects and understanding networking.

WHAT I'D LIKE TO DO:

1) Incorporate 2x Dell R330 servers ($40 each) as NAS, which each have 4x hot swap 3.5 HDD bays.

2) Use the 3700x machine as a transcoder to serve the media around the house (lots of smart tvs so want to make sure different video formats won't cause issues)

FEASABILITY:

1) Getting the hardware itself isn't the problem, but I want to know if this plan is possible in terms of functioning with HexOS

2) Even if feasible, does this plan make sense? Is there a "better" way to go about this, or am I tackling the problem entirely from the wrong the viewpoint?

3) Open to all other feedback.