World 70-90% EM 10-30% Europe unnecessary, as already represented in the World.
Personally, I would even go for 100% World. Many companies generate their sales worldwide. I therefore consider weighting by region to be outdated. But that's just my opinion. Objectively speaking, the emerging markets should certainly not be neglected.
I do 80/20 Developed/Emerging as a middle ground between market cap and GDP weighting. Of the Developed only 70% in MSCI World and 10% in the Europe 600 I also find a good approach. However, I wonder how you decided on these 3 ETFs. Aren't there any ETFs for all 3 indices that perform better after taking TER and TD into account?
I think that's good. However, you don't have any smaller companies (smallcaps) in it. I would therefore take an EM IMI ETF instead of the emerging markets ETF, and replace the Europe ETF with a Europe smallcap ETF
For example: $XXSC Or even better: $ZPRX (Since value stocks generally perform better over the longer term (especially with small caps).