You can apply poses to a figure without fuss. But seeing as this prop will be parented to a figure, not of concern. Poses can easily be applied to props that are parented to a figure.

I see. The wings come straight out. Morphs should be fine for that. I'm actually glad, I'm having problems with my computer's fan (it's still under warranty though) so I'm avoiding anything but preview renders until I send it in to get serviced... sigh.

You can parent a figure to another without incident. People commonly do such with hair meant for other figures.

As far as your morph problem goes it's hard to tell what the cause might be but it sounds like scaling. You stated that it's a smart prop though, so that introduces another layer of uncertainty. Probably best to make sure everything works as intended before saving as a smart prop.

As far as making a conformer goes, it's not really that difficult. It's been a while though.

I would get a stripped out version of the target cr2 (commonly known as a blank or dev cr2) which has had all morphs, IK, and Materials stripped out. I'd take a copy of that into the set up room and delete all the bones except for the neck, chest, collars, abdomen, and hip. Resave this version as rocket pack M4 cr2, open in a text editor and point the cr2 at your rocket pack obj. Make sure that the Obj has a chest group. That's really about it... although it's been several years since I last made a conformer so I may be forgetting some things. It's the kind of thing that is easier in execution and problem solving than spontaneously describing really...

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W10 Pro, HP Envy X360 Laptop, Intel Core i7-10510U, NVIDIA GeForce MX250, Intel UHD, 16 GB DDR4-2400 SDRAM, 1 TB PCIe NVMe M.2 SSD

Mudbox 2022, Adobe PS CC, Poser Pro 11.3, Blender 2.9, Wings3D 2.2.5

My Freestuff and Gallery at ShareCG