A 3rd party custodian (trust company, generally) is good for static investments that do not require quick funding or much in the way of ongoing maintenance.For investments that are more interactive in nature, a Checkbook IRA LLC or Solo 401k may be the better option.  

I believe anyone who has had interaction with me would agree.

Because action doesn't occur without interaction. 

We consider our income passive because we have very minimal interaction with guests.  

I might be off but I gave him my foreman without me interacting and he charged 17k to do it -- rip off the old work and re-do the whole thing.

Every day I interact with people making the same amount as myself and boy oh boy..They have a posh car / live in the center of the universe in 2.5 - 4k apartments / go on fancy trips.

I definitely have been interested in adding this to my arsenal of marketing techniques, right now I am just working with exterior drone videos and interior stills.The thing I do wonder about virtual tours, is if everyone can see the houses from the comfort of their own home, the human interaction in real estate gets severely limited.

The 2nd task was dealing with a few sources of data, that requires significant human interaction.

I have offered multiple times to manage the property for him and set up everything online, but he likes the interaction and being part of the process.  

The problem with aluminum is it's often connected to Copper and the two metals interact leaving a poor connection between the two that can end up as a fire bazaars.