Device case / enclosure design 2

Need another simple case design of electronic devices, for rapid prototyping & mold template (can be exported STL) a bit similar with my previous project. Case itself will be in plastic. Notes: 1. There will be 2 size versions for this case. Dimension of PCB is square (L) 50mm x (W) 50mm, 1.6mm thickness. 2. Max height 19mm for backside & max 11cm for front side (leaning towards user for easier usage) 3. PCB will be placed at the top of the case. (Top side will be flat, pcb & case) 4. All corners of the case should be rounded (except top & bottom). Case will be placed on flat surface. 5. Part of backside can be opened for battery (50mm x 15mm). 6. See draft drawings on attachment for more detailed view. Should be quite easy. Suggestions are welcomed. Thank you