Any retirement plan would need to be kept at arm's length, and could not be combined with personal funds or sweat equity on your part.A ROBS plan would allow you to capitalize your business with prior retirement funds, but is not something we would recommend at less than about $75K as it is complex to establish and maintain.Your only option if you really need to access those funds is to take a taxable distribution and pay an additional 10% penalty for early distribution.  

People get trapped in a loop of podcasts and books and sweating if they should use a 7.9% or 6.3% vacancy factor.

The break even point is a little longer for $105,000, but still a good investment option if you have the capital and don't want to put in any sweat equity - the best part of tiny houses is they can be built off-site and rolled right onto your lot, which is great in rural areas where finding contractors is difficult.DM me if you'd like to talk more about the weird and wonky (but highly profitable) side of real estate investing :).

They were sweating uncontrollably, I was watching them and came up with the idea.

All for 8 hrs of work, half of it dripping sweat in an attic. 

We've been working on the demo ourselves to mitigate costs and put in some sweat equity.

No sweat.

I was wondering if there are any 'sweat equity' type deals that would appeal to private money investors.

Sweat Equity Baby!!! 

Worked 9 months, all sweat equity, invested about 20k.Financed the next four, very high ROI, ruthlessly used passive income to pay off two in a few years, then financed two more