Opportunity cost
If your company has competent people who build stuff who are sitting around waiting for work, then sure. This is the sort of thing that you allow your workers to "play" with in their free time and raid the strap bin for parts.
This would also be a great task for the intern or apprentice to learn how to draft something up or weld together under the supervision of more senior people.
But if your shop is paying overtime and turning away profitable work so that the staff can build a ramp, it's mismanagement of the highest order for them to be puttering around building something that the secretary could arrange to have delivered and installed next Tuesday.
On the other hand, there's no better way to earn Brownie points with the owner than do be known as the guy who got his special project done.
Biting the hand that feeds IT
