Yeah, $50k is really high by itself especially with the additional $45k. That's nearly $100k in cash.
I get it though, you build up that cash amount so you get comfortable with it knowing it's right there in front of you, easily available. Then in one investment (home remodel) over half of it is gone so now there's an uneasy feeling not seeing that amount readily available to you.
General rule of thumb is to have 3-6 months of expenses in an emergency fund. I prefer 6-8 months so you'd only have to get to $21k-$31k to hit that mark. I believe you, personally, want to separate your savings from your emergency fund (makes sense) so rather than borrow through a HELOC (doesn't sound like you need it now, so what's the point?), for now I would use my savings as my emergency fund and start saving like crazy again to build that emergency fund back up to $30k or so.
$50k for just emergency use, while it would feel good, you could end up costing yourself purchasing power.
It also depends if you're going to retire in 5+ years or any time soon. Max out that Roth IRA, 401k, etc. Definitely talk to a financial advisor on what to do with your extra cash, but a HELOC is making little sense since you don't sound like you need a large sum of cash right now.
Why pay someone money (closing costs, interest) to get more cash that you don't need or plan to use?