It all depends on how much you value your time.

I can't say how big a job it is to cut and bend your own tubing. But I can comment on buying and installing pre-cut and bent tubing. I just finished doing that on a 55.2. My guess is that it saved me probably at least half a day of work, maybe more. Plus I didn't have to buy the tubing bending and flaring tools. For me the cost of pre-bent was well worth the time saved.