Thanks Neil!!
I checked Joram's post/build on a Dutch forum and on Savage Central, also have him on MSN so that's not a problem. Read the first topic though, I only searched for FLM49000 that's why I didn't find any info (stupid me).
It has a good strong stock servo

, also have some others so will see how the shock holds up after the conversion (if I buy it the guy is asking $140 NIB incl shipping).
ps. I also have some LST shocks which I might bolt on using these 2 parts:
VTX-85769 &
VTX-85771 like Joram did
here or are they any reasons not to do it like that (strength) ?
Here Joram is saying he want's to buy the
FLIGHTPOWER EVO30-4500 6S which measures 165.0mm/44.1mm/49.1mm. Assuming it would fit my current 4S packs (33mm) and maybe future 5S packs (40mm) would also fit even tough the Blur might have a bigger diameter.