Got a keg set up for $50

Got a 15.5 gallon keg that was previously used as a hot liquor tank. I am a newbie newbie and figured this would be great to modify and build upon in the future. It felt like a good deal so I scooped it up. Better than a cheap all-in-one from target anyways 🤷🏽‍♂️. Right now it will just be used as a giant kettle to heat and transfer to a bucket fermenter. It has a quick-connect outlet that siphons the very last drop out of the bottom, comes with a stainless hop basket, a volume sight glass on the side, and has a thermometer installed. I want to brew an extract brew first, and then will be using the system for all grain brew-in-a-bag type brew with the hop basket later. I could drill another hole to add an electric element down the road, could swap out the volume sight glass for a recirculating system and pump later. Has plenty of volume so could brew a variety of batch sizes (I mean… 5-15 gallons so not really the small batches on this). Is this a good thought process and system for a newbie that wants to push into the craft and have room to explore? Or am I in over my head?