You’re on the right track, but don’t forget the basics that most designers skim over. First, the panels themselves—if you’re adding layers of soil, mulch and plants, that’s a ton of weight. Make sure the roof’s live‑load capacity, plus any dynamic loads from wind or maintenance, can handle it. Second, drainage is your friend; a slick surface will keep water pooling and could lead to roof damage. Install a proper sub‑drain layer and consider a waterproof membrane that’s compatible with the bio‑filter. Third, anchorage: the panels need a secure way to stay in place, especially if you’re going to have a substantial root system. Use corrosion‑resistant brackets or a flexible tie‑down system that can accommodate soil expansion. Finally, think about access for maintenance and for the pollinators themselves—ensure there’s a safe route and that the materials you use won’t trap them or expose them to chemicals. If those points are covered, you’re in good shape.

Sounds like you’ve got the right plan. Just keep an eye on the walkway’s footing—if it’s too slick or too high, both the pollinators and the crew will lose balance. A simple ramp with non‑slip material should keep things moving smoothly, and it’ll give you a decent inspection route when the roof needs a check. Good luck with the build.