CoC Bow crafting advice

Hi,

not sure if this is the right place to ask but I'll try.

I tried to craft a dex stacking bow this league but somehow failed^^
instead I crafted:
and


the first one is currently in use (because I don't have a proper replacement)
the second one is unfinished as u can see.
now the questions:
- is CoC Bow build somehow viable?
- is the magic base I have a candidate to move on with?
-> if yes, what a possible good rolls to hope for?

I don't have the currency to slam, nor do I have the multimod receipe by now.
I do have the Einhar magic imprint - how rare is this? Worth using for this item?