Re: Cannot remove internal bodies in a during shell command: intended for convert to sheetmetal
This shape may be a little too complex for a simple Convert to Sheet Metal operation. if you can't even create the shell in modeling then it is an unlikely candidate.
Try converting just parts of the design and do not define the rips before conversion, do it during.
Other options are Sheet Metal from Solid or the Forming Flattening tool in Modeling (image below is my effort)
Finally, if you can't model it directly in Sheet Metal then it is unlikely that Convert to Sheet Metal will process it - after all, that is the purpose.
Best of luck,