Custom cables / connectors

Any reason to not make my own custom length cables? 50ohm co-ax, SMA one end, N-type at the other. Do crimpers and suitable connectors exist for both ends?
Hoping to mount a Pi (3B) externally in a waterproof box, nearer to the antenna, hence the custom cable, and power it using PoE, so a single cable to make it easier.

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Unless you have the tools and are confident you can correctly make the cable yourself, it might be better to have the cable made by a cable vendor.

Pasternack does this:
https://www.pasternack.com/t-cable-creator.aspx

I have no idea what their prices are now, but I used to have lots of coax cables made by them in a previous life.

No problem in making the joints myself. Done hundreds in a previous life, albeit mainly Triax and the like, nothing as small as SMA though. Just wondering about the availability of crimpers and parts.

Actually, if you just need a cable with sma on one end and N on the other end, you can buy that at Amazon.