Question on a box lid (Jewelry Box)

So I am fairly new to the Shapeoko family and obviously to Carbide as well. I was able to create a box what has and outside lip and an inside lip which fit together perfectly. My concern is that the lip is only an 1/8 of an inch and I would like to get it to a quarter of an inch. I took the line and on the top cut outside right and on the bottom cut inside left. It fits great just would like to have a more substantial lip.

Any ideas on how to do this in Carbide Create?

I also put a ledge on the inner bottom box to allow for small boxes to sit for rings and earringsā€¦then cut it out even deeper to allow bracelets to sit at the bottom.

Would love some help making the lip even bigger - I am about 3 weeks into having the machine. Thank you in advance!

Post a photo and your files?