is it possible to get part for arrows and bows only?
Yes there is
Open the Heirloom models file, keep going until you get to a point where there is a "copy" file and a mod.xml
Open the mod.xml, I use notepad for this
Then delete all the lines that are not bows and arrows, e.g. <replace_model item_id="itm_dagger_swup" model_id="long_dagger_h1" model_id2="long_dagger_scabbard_h1"/>
Anyone else can use this to remove models heirloom models and stay with original
Any further questions you can PM me
To make the current heirloom pack useful I would need a list of all the items that have had their models replaced, e.g. Heavy Great Sword. Also if any item has been renamed, like masterwork bec de corbin is now Mighty bec de corbin
Then I could update the pack and share it