By ring do you mean the seal or gasket? I change both the upper and lower seal once a year. I need to due to frequent use. It takes about 1/2 hour tops and costs is like $20.
No. The ceramic rings. I watched a few videos of how people clean theirs out and there's these two rings a the very bottom. The guy in the video said he saw a few hairline cracks in it. I'm quite lazy when it comes to cleaning stuff like that out. In the early days, I ruined a few shop vacs that way. My neighbor's then gardener, in broken English, recommended I throw in sand and spray water. He'd heard me saying beautiful words out loud in the middle of the day. Sand when wet clumps to the ash and after a while clumps up. I go in with tools and scoop it out into a trash bag.
I'm envious over having the income to build what you want in your yard. Since I only cook for myself or to give away the large is perfect for me. A friend who has a lot of money but frugal bought the medium and he's often disappointed because he can't put as many items on it.
Do you envy working up to 70 hours a week, including from home?

Don't be too envious. It took me roughly 6 years to decide on a lump coal bbq. Spending 5K is a lot of money, even if you have a lot of money. I bought my current gas grill on sale for I think 550. And barely used it the 2 years and felt awful over wasting all that money. It wasn't until I modified it that I started using it more. Up until then, the last time I owned a gas grill was a tiny one in the late 90's and it sucked big time. Everything would taste like propane. I believe this was a common trait in gas grills at the time.
I love the Santa Maria! Nice , nice grills! I can't justify the cost or footprint on my patio but yeah...I'd love to have one. If I did I'd have neighborhood grill parties every month.
Oh it's going to be small. Maybe something to hold 3-4 medium sized tri-tips or large cuts of flap meat. I have a feeling I won't get approved by the city to build one, because of the fire danger. I don't think anyone's got one in their yard in the area let alone most of SoCal.
Edit: I forgot your last question. I can't remember ever searing anything after smoking. I've reverse seared things but not after a low temp smoke. At least from poor memory. I have used a torch for effect on some things. I don't find the need for what I cook. Maybe I need to learn more about it. I have seen other backyard cooks' meat torched and didn't like the appearance. I don't think they knew what they were doing so it looked kinda obvious to me.
I'm not too familiar with reverse searing, but tend to do it on grass fed cuts of beef. It renders the inner fat better. It does taste very much like the beef I ate from cows when I was younger (not in the US), but I still can't get over the odd taste now as I've grown accustomed to the grain fed meat. I'm going to try a French style bleu flank steak this summer. I usually go with medium-rare to medium. I've had raw beef before, but it's an odd texture thing for me.
It's a hard lemonade afternoon. I didn't know lemonade was that easy. Squeezed lemon and simple syrup. I'm just adding vodka at the table.
Lemon or lime, vodka or tequila, and a citrus flavored La Croix, plenty of ice. Sip that.
As far as hosting goes, I've got a good idea of how much people will consume so there's little waste in the end. I made a Carolina sauce last summer and that was a hit. Less on the sweet and more on the hotter side. It also cuts through a pork butt's strong fatty flavor. Chicken is a hit with women. I don't mean to be sexist, but women prefer BBQ'd chicken over say beef or pork or sausages.
As far as sausages go, for events like family get together, I stray on the safe by getting them made on the day of the event or if it's not enough, pickup several packages of Aidell's.