Another important part of your prototype is the casing you plan on using for your device. This actually has a greater impact than is imagined, as the material of the casing will have a real impact on the radio performance of your prototype.
1) For better performances, consider plastic. Metal casing might look more solid but will create issues for your device, especially for radio propagation.
2) For quality purposes, you can also consider off-the-shelf casing. While 3D-printing is very interesting for very low volumes, because you can design exactly what you need, it can become expensive and require extra work to adapt to your needs. Off-the-shelf solutions should be considered for low-volume orders. Multiple references are available from your local distributor.
3) Depending on your use case (particularly outdoor or industrial use cases), IPXX casing is worth considering. It will adequately protect your design from being exposed to water or dust.