In short, it probably costs nearly the same (relatively speaking) to build a 600 sq/ft house as it does to build a 1200 sq/ft house but you get much less spread.

I'm also a skilled handyman and was considering offering my services to other investors as a separate business venture.My question is:Is combining buy-and-hold rentals with handyman services for other investors a wise approach, or will it spread myself too thin?

Lot of fabulous new idea is spreading around in twitter these days , and it is pretty credible.

Another benefit depending on the seller's tax situation is that they can spread their cap gains and depreciation recapture tax hits out over several years rather than paying it on the lump sum in a typical sale. 

But how much a point buys your rate down depends on the pricing spread.

Deals have huge profit spreads (I buy houses for 7 cents to 30 cents on the dollar)6.

I'd be interested in spreading out but need to start with a true BRRRR in any market.

This means that it will be extremely likely that you will be cashflow negative from whatever investment you are looking to buy and will need to be able to cover that monthly spread out of pocket. 

When an area the size of Hillsboro Oregon gets a 50 BILLION dollar influx that money is going to be  spread wide and deep.

This is because you're spreading the income out over many years rather than making a large contribution in a single year, which may put you in a higher marginal bracket.The part with a traditional 401(k) that doesn't get taxed is the time the money "sits" in the account.