Here's my version of an extended top cover holder for the Creality K1, with hinges and built-in LED strip holders.

I've also uploaded a STEP file so you can see how everything is assembled and modify it if necessary.

The focus here is on using brass heated inserts to make the design more compact and reduce the amount of plastic. For hinges, pieces of filament are used. The holes for the heated brass inserts are designed for drilling to the required diameter of the inserts available. The side panels are attached with M2 screws screwed into either plastic or brass inserts. Additionally, the "floors" can be fastened using connectors. This design allows for stacking panels on top of each other if there's a need to raise the cover higher.