[SDPhantom]

Originally Posted by glupikreten 1. Im trying to do some basic modifications to some default blizz frames... and while some of the frames i have no problem with for some others im getting error that frames are not found.

Some parts of the UI are contained in Load-on-Demand code. These are loaded like any other addon with their names prefixed with "Blizzard_". You can either force-load these using LoadAddOn() or listen for ADDON_LOADED to fire with their name.

For example:

LoadAddOn("Blizzard_CraftUI");
LoadAddOn("Blizzard_MacroUI");
LoadAddOn("Blizzard_TalentUI");
LoadAddOn("Blizzard_TradeSkillUI");

- or -

local LoDMap={--    Maps Blizzard addon names to frame list
    Blizzard_CraftUI={"CraftFrame"};
    Blizzard_MacroUI={"MacroFrame"};
    Blizzard_TalentUI={"TalentFrame"};
    Blizzard_TradeSkillUI={"TradeSkillFrame"};
};
 
local EventFrame=CreateFrame("Frame");--    Event Listener Frame
EventFrame:RegisterEvent("ADDON_LOADED");
EventFrame:SetScript("OnEvent",function(self,event,...)--   OnEvent Script
    if event=="ADDON_LOADED" then
        local framelist=LoDMap[(...)]-- Loads list from map using addon name
        if framelist then-- Check if one of the LoD addons in our list
            for _,name in ipairs(framelist) do
                local frame=_G[name];-- Get our frame from the global table
 
--              Do stuff
                frame:SetScale(1);--    Set scale of the frame
            end
        end
    end
end);

Originally Posted by glupikreten 2. Is there easy way to remove default border (red, green, blue... ) from targets buffs/debuffs?

Probably the easiest way would be to overwrite entries in the DebuffTypeColor table.

DebuffTypeColor.Magic=DebuffTypeColor.none;
DebuffTypeColor.Curse=DebuffTypeColor.none;
DebuffTypeColor.Disease=DebuffTypeColor.none;
DebuffTypeColor.Poison=DebuffTypeColor.none;

Originally Posted by glupikreten 3. Id like to be able to see in my buffs/debuffs the source of that buff... is that possible in classic? i have this script that worked perfectly before... for the love of god i dont remember in what version of wow tho

Aura sources weren't available in Vanilla and as such, were removed from Classic.