Best practice is to advise them to get counsel from actual professionals; estate planning and planning in general is not a great DIY hobby it would be beneficial for you to have contacts like attorneys, accountants and advisors to refer your clients in this case.   

For example:  I want to develop a strong passive income stream to:  (this is a why) so that I can not rely on a 9-5 job and have the FREEDOM of TIME to: (TRAVEL, Spend more time with Family, concentrate on a hobby, volunteer with a NON-Profit, develop a business ect). 

These custom spaces are designed to cater to the specific needs and interests of the current residents, providing them with a dedicated area for their hobbies and activities.

These type of tenants always target the hobby/ mom and pop landlords because they know they are lax at screening.

Turns out he’s a REI as well as a business owner in his hobby/trade.

I do, as researching investments is a hobby of mine.  

My hobbies and what makes my money are the same thing. 

You must have a legitimate self-employment activity (a hobby would not work) and you must maintain this business in order to maintain your 401k plan, in other words there needs to be continuity for your self-employment activity. 

My hobbies include yelling at the TV while watching sports and popping bubble wrap.

My hobbies as of now include working out and playing Halo on xbox.