OK...haven't looked at pics of your motor lately.
Just have someone do it. One thing, make sure there is enough clearance for the plates...a slight bend to match the lengthwise contours of the cover helps, and don't make them too far away from the cover. You might want to stick on plates with some putty of different thickness to check for clearance (no...please don't run the motor with just the putty holding them
).
Really, your only problem with the
oil seepage is the lack of splash plates. You need to deflect the
oil.
You notice originals using pentroof covers without splash plates used a breather at the front of the manifold...not on the covers.