So I kinda got model replacements working?
So here is my process
-Decompress Objectpack.arc.LZ and rename to Objectpack.arc
-Use Brawl crate to export any arc I need (Kuriimu2 can also be used, but I use brawlcrate just because I am gonna be using it to edit the files anyway)
-Open exported arc in Brawlcrate -edit textures -for models, I will export the original model as DAE, then make the custom one match it in terms of mesh count and materials (similar to twilight princess)
*For blender, make sure you click importunits in the DAE import section! also rotate upon x axist -90 degress and apply transformations
-Export as DAE -right click the model in brawlcreate, click reimport meshes (NOT REPLACE) Make sure settings all say true and model version is 11 (except Force CCW primitive cull)
-Save the arc -Open Objectpack.arc in Kuriimu2 -import the edited arc, save -LZ11 compress Objectpack.arc and rename to Objectpack.arc.LZ
Notes:
-Replaced models seem to have the limit of Less than or equal to the original models polygons
-Some models don't, like the Hylian Shield and the Master Sword sheath.