Hey Travis!
I work as an Estimator for a home builder in Des Moines. I previously worked for a builder that built in Cedar Rapids as well. I hope you were not hit too hard by the Derecho!
I use excel for organizing most of my work and have gotten pretty good at estimating without the fancy software by having an accurate set of architectural drawings and PDF pro (measure tool) to pull dimensions and figure material.
I recently watched a youtube video showing Rehab valuator software that creates the checklist and allows you to enter bids into the software to reference later. The brief overview looked helpful but I have not had much time to review further. Link below
https://rehabvaluator.com/upgrade
If you want someone to review your checklist to make sure it is all inclusive of costs, I could be of some help. Just send me a DM.
I built my own house 3 years ago and was the GC. It was a lot of work but worth it in the end. I hope your project goes well!