That's some improvement!! .... back in the day cars just had the sump breather pipe clipped pointing down at the road .... so I doubt letting it vent to air out of the way will be an issue if you fancy a drive before the catch-tank kit appears.
I made one in the past out of a cheap alloy cyclists drink bottle, just drilled a hole to hold the pipe on the plastic top and a ring of small vent holes round the top shoulder, even came with a holder for about a fiver ... looked fine and did the job
K
