You can definitely use a different bottom metal. If you want it to be 100% aesthetically pleasing, it CAN become pricey quickly. I don't have a Seekins on-hand to take a look at right now, but it's generally easiest to go from a smaller inlet to a larger one. This will ensure that there is no open gaps anywhere. That gaps would not affect function, but they can look weird. If you end up going to a bottom metal that is smaller in some areas, those gaps can be bedded and then coated to match the stock. In some cases, the entire stock may need to be re-coated in order to look aesthetically pleasing. The actual inletting is fast and cheap; the additional charges for bedding and coating add up quickly, though.