Design Logic Help Requested

@mwebdesign

Do you use CodeIgniter in your platform at all? You have mentioned "a bunch of javascripts", the front-end framework vue.js so far. I wonder whether here is anybody capable to help, we talk about CodeIgniter mostly.

Anyway, I think, you are at risk to face a disaster. I serious company should not put you under such a big challenge, quite bigger than you are. I faced a similar situation ago, it took me about 3 years to get rid of the old code. You need a plan and an estimation on what time and workforce this plan would take. You need understanding and support from your company. As a minimum they should have objective knowledge about the current code quality.