How to structure a potential deal in Home Healthcare

Hi Everyone,
There is a potential deal on the table for a home healthcare company, they are doing $3m in gross revenue, $300 EBITDA and $400k SDE.


They are looking to sell for around x3 or times the EBITDA, which seems fair. (so $900k=>$1.2M depending on the terms)

I'm looking to be a passive investor in that deal and have a searcher run the company as well as obtain the rest of the funding through an SBA loan which s/he will be personally guaranteeing.

I belive they will be open to partially providing seller financing as well.

So anyway, how can this be structured?

Say I can get it for $900K, out of which $450k would be seller financing and $450K would be needed at the time of closing.
Out of that, can I assume that the SBA will be able to provide %90 down and so $50k will be needed to close?

I'm also guessing there will be say $20k closing costs which I'll pay for, so the total cash needed from me would be $70k, does that sound right?

What percentage of equity can I get in that case in regards to the split between myself and the searcher? Anything else I'm missing here in the calculation? thanks so much for your feedback!