The term "Разделочный стенд" in the context of aircraft design can be translated into American English as a "disassembly rig" or "assembly/disassembly jig." This translation depends on the specific function of the rig within the manufacturing or maintenance process. Here is a breakdown to ensure you use the correct term:

Disassembly Rig: This term is used if the primary function is to hold parts during disassembly. It's commonly used in maintenance or overhaul settings where aircraft components are disassembled for inspection and repair.

Assembly/Disassembly Jig: This term is more general and can be used if the stand is used for both assembling and disassembling parts. Jigs are special devices that hold workpieces in place, guiding the tools operating on them. This term is highly accurate in manufacturing contexts where precision is crucial.

Fixture: If the primary function is to securely hold the aircraft components during various manufacturing processes, including but not limited to cutting, milling, or drilling, "fixture" might also be an appropriate term.

Given your description of the "разделочный стенд" as a "spatial structure that consists of base elements for installing and securing the product, templates, and metalworking machines," the most suitable translation would be "assembly/disassembly jig". This term effectively communicates the stand’s use in both assembly and disassembly processes, involving precise placement and machining of parts.

Here is how you might include it in your translation:

"The assembly/disassembly jig is a spatial structure that consists of base elements for mounting and securing the aircraft components, guides (or templates), and metalworking machines. It is used during the assembly and disassembly processes to ensure precision and stability."

This translation uses professional terminology appropriate for an academic or technical context within aerospace engineering.