Sure. You buy a chinese case with 6-8 bays off Aliexpress, throw some board with ECC RAM support into it and a few disks. You install TrueNAS Scale on it, setup a OpenZFS pool. Front panel lights are controllable via Kernel [0], it even offers a ready-made disk-activity module if you want to hack. Surveillance cameras are handled by Frigate, an open source NVR Software which works really well.
Especially when you want to build and learn, there's next to no reason to buy a Synology.
Very valid advice, but you don't do all that in "an hour," of course. Synology's purpose in life is to provide a solution to users who are more interested in the verbs than the nouns.
They are the Apple of the NAS industry, a role that has worked out really well for Apple as well as for most of their users. The difference is, for all their rent-seeking walled-garden paternalism, Apple doesn't try to lock people out of installing their own hard drives.
Kudos to Synology for walking back a seriously-stupid move.
Once you have the case, an hour or two is pretty reasonable... you can even have your boot device pre-imaged while waiting on the case to get delivered.
Not to mention the alternative brands that allow you to run your own software... I've got a 4-bay TerraMaster (F-424 Pro) as a backup NAS. I don't plan on buying another Synology product.
Especially when you want to build and learn, there's next to no reason to buy a Synology.
[0] https://www.kernel.org/doc/html/v5.3/leds/leds-class.html