Since the unit designer is a bit counter-intuitive, I have a few suggestions for improvements that would make it more comfortable to handle.

• When you press "Edit" on an existing unit layout in the design screen you can alter the unit's equipment but you can't overwrite the current design. Instead the game creates a second design (sometimes with the same name as the first). Being able to overwrite would make it easier to update obsolete designs (with newly researched weapons, armor, etc...) and open up new possibilities to make the unit upgrade function more comfortable.
• If a unit design has been updated/overwritten the upgrade function on the world map should just change the current armor/weapons/etc of the unit to match the new design instead of just adding the biggest armor and most powerful weapon. This is often a problem if you design specialised units, that rely on high initiative. They get overencumbered with the big weapons and armor.

These are just some ideas I had while playing. What do you guys think? Would you benefit from these changes?