First suggestion: Please either make the ingots smaller, or the anvil bigger. There is little that's more frustrating than missing an order because it took 30 seconds to get the physics to let you stack all three ingots somewhere on the anvil. Ideally, skip the problem entirely and let us 'snap' ingots into place on the anvil the same way that we can snap weapon pieces together - this way, we don't have to worry about a problem I encountered last night where I was trying to make a greathammer, but somehow ended up making a regular blade and a small blade as one ingot began to tumble away from the others as I took the final swing.
Second suggestion: regular blades and great blades have some wonky anvil properties. Regular blades initially spawn on the horn of the anvil, and begin to tilt, but ultimately don't. However, if you hit that blade again, it respawns perfectly balanced in the center of the anvil. Great blades are a nightmare because they, too, initially appear on the anvil's horn, but are long enough that they always end up toppling off the anvil, requiring seconds to try to pick up, manipulate, and balance back on the face of the anvil so you can hit it again to make it a greathammer head. If at all possible, I highly suggest having the initial blade for both weapon types spawn in that perfectly flat, balanced position that they appear in if you start cycling through all the appearance options, because nothing gets more annoying than seeing "Give me a greathammer, NOW!!!" and spending five seconds trying to get the great blade back on the anvil to keep working.
Third suggestion: Don't make it possible to earn less from a sale than the cost of the materials that went into making it. I made a tin dagger out of curiosity. I got it to the customer within seconds because I already had it pre-made, and got paid far less than the cost of creating it. That's never fun.
Fourth suggestion: Take physics out of weapon construction entirely. It causes so many problems and frustrations, especially with unwieldy items like greatsword blades and polearm handles - it would be far easier if there were simply places on the table you could put the weapon parts onto that they would 'snap' to, with a button to assemble a weapon out of the parts 'attached' to the table. This would also likely help with the problem of having items become stuck in the table, or weapons 'merging' like I had happen last night (I had left a one-handed sword on the assembly table. When I placed a greatsword blade on the table, somehow the one-handed sword's grip and guard snapped to it, and I lost a sale while trying to get the monstrosity disassembled. Then lost a second sale on the one-handed sword because it was no longer counted as complete for some reason...)
Fifth suggestion: One way to add some strategy to the game might be mass orders. Let's say you wake up, go downstairs and find out an adventurer looking to outfit a new adventuring party has requested 2 greatswords, 2 one-handed hammers, a polearm and a dagger, all made with specific parts and appearances, before the end of the day. You have a choice: Do you take the order and skip out on possible greater earnings serving random customers - if you can serve them fast enough - or play it safe and take the mass order for less potential profit but more assured profit?
Sixth suggestion: Rather than repeatedly hammering to cycle through appearances, I suggest a radial menu that lists the appearance options before you start swinging. You use the menu, choose your appearance, and then start swinging, ending up with a weapon with the chosen appearance.