Would it be practical to just (mostly) draft o-line this upcoming year

[30gut]

The draft is a crap shoot but often times a 1st / 2nd round draft picks can and should have immediate impact.
The 3rd round pick and 4th round picks are less likely to have an immediate impact although this would be a place where you can still find decent interior OL

With the 1st 3 rounds i would try to land at least 1 OL and 1 DL:
maybe take a 3-4 DE in the 1st round then take a RT and Center in the 2nd/3rd