I asked myself if the bayo would fit, but didn't (don't) have one.
I have seen the modded one when I bought my norc
in Lever's shop, it belongs to somebody from the store.
But again, I don't know what the mod consists of.
If the lug is too big, too small, whatever,
it comes apart completely and with some patience,
somebody can mod it.
If you want to make a completely new one, it should be easy.
Only the curved surface (channel) where it matches the barrel
would be a little harder.
Basically, it's a piece of sqare bar stock with
3 machined channels, a notch and a hole, IIRC.
Also, if you make a new lug, the hole for the pin should be made the last:
Put it on the gun (with the bayo), determine the best position,
mark (thru the wood and band) the location of the holes in the lug
from both sides, take it out and drill it.
Theoretically it shouldn't be hard,
but I guess it requires time and patience.
I know nothing about the slings.
In the long thread from the last winter,
there was some info about some (yugo???) sling.