i suggest you check the already craftable items, those item costs are very high for such crappy gear. pipe rifles should be 1 junk at most. and zip guns should be 1 junk at most as well. i doubt very much the wood used to make either of those is anything more than scraps anyway, just like the junk you found, and its name is "junk" not "metal junk parts" as well. junk could be random scraps of wood from old table parts to.
also, the switch blade, i'd suggest 1 junk or 1 metal parts item, as for the club, the price i can agree on. shiv... 1 junk should be enough, at least looking at the Fallout Tacitcs version of the item anyway.
Wrench... i agree, 2 junk is fine for that.
anyway, cheers.
-Ulrek-