Building an UM2 Extended clone vs. an UMO+ clone is no difference.
Personally I would ditch the UM boards and use a Duet3D, or some other modern board. But if you look around there is a clone-v2.1.5 version of the UM2 board with removable steppers available. But given that it is a clone I would not buy it...it's a hit-or-miss kind of chance not worth taking imo. That said, using a different board means no more UM firmware...so it will no longer be a 1-1 clone.
If you want to keep the UMO board and change stepper you can also build an UMO Extended...just make the side panels higher...all you need to change in the software config is the height of the build area.
If you want an amazing extruder I can recommend the Zero Gravity Extruder. I, and a few more, have been using it for a long time and it is awesome...regardless if you are printing stiff or flexible filaments.
Rods can be bought from many places...Misumi if you want the best...Robotdigg (or similar places) if you want to save some money.
If you look at the Ultimaker 2 Aluminium Extrusion clone at Thingiverse you will find hints on where you can source material used to build an Ultimaker clone.
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gr5 2,224
It might be easier to just straighten the rods you have now versus sourcing new ones. There's a guy who posted a video of how he rotates the rods and can measure easily where the bow is the worst - then he markes the rod then bends it the other way and then retests it. I think he fixed all his rods in an hour or so.
I am not a fan of E3DV6 all metal. This hotend you are thinking of - is it all metal or does it have some PTFE? I strongly recommend a head with PTFE. I believe their 3mm head is all metal but they have a 1.75mm head that is quite excellent and has some ptfe in it (teflon). The problem with all metal is you can print anything but PLA and PLA is the best material out there (overall properties and ease of printing). But if you are willing to switch to 1.75 or if you are never ever going to print PLA again (which is fine - PET/nGen/CPE is a fantastic material also) then go for it.
They may tell you it prints PLA but it doesn't. It gets stuck. molten PLA sticks very well to all metals.
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