Thx for contribution Unloaded!
Think I'm gonna run separate loops on one rad, just drill and solder the fittings on the rad. Yeah, the pump I own is pretty much only one EASILY available in line pump here, and the price is decent. I can buy two for price of one Eheim 1046 (also Eheim is not available locally, I'll have to wait for few weeks for delivery).
#Rotor: I never thought about wearing of Dremel disks, you're right, this might become an issue...but I already punched the start holes in one half of the block, so I guess I'll have to try to make it...
This is what I've done today
