Cage Questions regarding two-level cages and ramps

Hello, I am using a basic, single-level C&C cage right now and my mom and I are planning on adding a second level to our cage. For this I am considering my old pet store cage's plastic base as a hay loft/kitchen at the upper level (we'll just make an entryway by cutting the plastic base), will this be a good idea? And how should I go about making the ramp? I want it to be easily moved/raised for cleaning purposes, but at the same time be secure enough for the piggies to go through.

And can you give me any tips on cleaning a two-level cage, will it be harder for me to clean it and replace the fleece at the bottom?