you gotta test before you invest
The creative field of making things is an expensive one. There is no ctrl + Z for when things just aren't right in real life. There are no "automatic updates", "patches", "hotfixes". If you don't get it right when you release, you will have botched the whole thing.
We have all designed things that look absolutely stunning on the computer screen but after a visual mockup we realize it's entirely too small, uncomfortable or unstable. Sometimes you get it right on the first go, sometimes it takes ten or twenty mockups. We can help you out with visual mockups that are full representations of the finished thing, as well as engineering mockups that help you get everything else in order. They can be high fidelity, or low fidelity to quickly test and iterate. If you plan on getting it right, get it wrong a few times before but cheaply!
Miniatures to full size for anything
cheap and fast, or fine and detailed
test the proportions and functions
check and refine your curb appeal