To be honest I think you're best off using oUF to try and recreate the unitframes, although that might take a while of learning.
To replace addons, here's a few:
ArkInventory -> Stuffing
CastingBarTimer -> You can do this in oUF
Friend Color -> yClassColor (applies to more frames, it's neat)
Omen -> sThreatMeter2 (do a google search for this)
Outfitter -> Default blizzard equipment manager? Works fine for me.
RatingBuster -> Do you need this? Personal preference ofc.
Recount -> TinyDPS, but if you use it for a detailed spell breakdown then stick with Recount.
SimplePercent -> You can do this in oUF
TinyPad -> Try using the default Windows/Mac notepad
Titan Panel -> LynStats
VisualHeal -> oUF_HealComm
WhereToNow -> Ask friends!
xcalc -> Use the default computer calc
Generally you really have a lot of addons. If you like minimalism, then you should always ask yourself "Do I really need this? Is it really bothersome if I don't have this?" Only if the answer is yes to those questions, get it, otherwise don't. Less is more.
Hope I helped a little.