Your best bet would be to consult with an attorney to formulate a plan and stay proactive.

But if they are savvy money people and they trust you (which I bet the do), then this seems very doable. 

All of the prior suggestions about local banks are your best bet.

It's extremely common for buyers in the Austin market to waive the appraisal contingency to win in multiple offers, which means they are removing their right to terminate or negotiate if the appraisal doesn't meet value. 

Your best bet would be to contact a local bank where the mobile home park is as they're more likely to lend compared to a nationwide bank not familiar with the area. 

Whatever you want but make sure to celebrate the wins along the way or you will burn yourself out.

I think a townhouse in West midtown could be the best bet for you to house hack of sorts.

That's definitely unique and I bet a lot of people could benefit from something like that.Happy to connect if you are ever down in the city.

If you don't have that comfort level, having a professional is always a safe bet but could delay your ability to get under contract quickly. 

Also when buying you don't pay the agents commission but the seller does, so its a win win for you and your agent.