Sounds like you've done some good planning and saving to be able to FIRE at 45. I might make a couple of suggestions you could look into to see if they might be appropriate to your situation.
1. Additional backdoor funding of your Roth IRA while you are still working. Since you are looking at a retirement horizon of close to 45 years (best case, or worst case, depending on how you look at it), getting more into the Roth where all your gains are tax free makes sense, especially since you are looking at at least 14 years before making any withdrawals.
2. I personally hate bonds and bond funds right now. Returns are well below the inflation rate and you risk losses when interest rates rise. I do agree you need a few years worth of withdrawals not invested in stocks/mutual funds/ETFs to avoid sequence of return risks (withdrawals made by being forced to sell stocks in a down market), I'm just not sure bonds should hold that historical place.
3. Your safe bucket of funds should be in your ordinary accounts. With such a long horizon, your Roth should stay fully invested.
For more information than you could ever want on Financial Independence Retire Early (FIRE), check out the forums on Mr. Money Mustache. Also check out Bogleheads forum if you haven't already.
