If you have a $400 budget, wholesaling is doable but you will need to commit more time.

Certainly its doable, especially if you are doing full rehabs or doing off market deals. 

The waste line will be more of a challenge, but certainly doable. 

So, under my definition if I have great credit, and a lender is willing to over finance the property because they know they can get my other assets if they need to foreclosure and there’s a shortfall, then that’s not a nothing down deal is essentially I’m using my other assets to secure the loan.So, under this strict definition of nothing down, are nothing down deals doable?

I'm not that knowledgable about programming, but this seems pretty doable. 

I'll have to see if that's doable with a rental property, as it will no longer be a family residence.

Flipping with a full-time job can be challenging but doable if you are extremely organized.

Maybe it's doable but seems like it could be a gray area in a not so good way. 

I certainly plan on utilising FHA loans if possible.In which case is buying a regular rental property doable just to start building up a portfolio?

Looks very doable.