tneva82 wrote:a) minor q but is the thing more of few big pieces or lots of small pieces to assemble? Any particular pitfalls to avoid?
Don't own that particular model but it looks like few big pieces with few small pieces:
https://thumbs.worthpoint.com/wpimages/images/images1/1/1013/20/1_2033f15fe88bf942260c7e84ed879c8f.jpg
tneva82 wrote:b) presumably pinning would be very, very good? How to ensure pinning lines up? First time building non-plastic model of this size...
Pinning is generally recommended for any resin builds in my personal opinion. Neither
CA glue or plastic glue does a "proper" job of creating a strong bond. Always remember to wash off the mold release to maximize whatever bond you can get however. As for the pins lining up, two popular method is 1) pin one side, place thumb tack on the other side & put the two pieces together to create an impression of the pin which you drill 2) place a small blob of paint and close the parts together, leaving two dots on both pieces you want to pin.
tneva82 wrote:c) would it be good idea to have the upper arc separate from base for ease of transport and if so what would be good way to do so? Pinning tabs? Big magnets? At which point how big magnets would be good? Presumably no convenient sized magnet holes there so would involve drilling big holes?
From what I can see, it looks like it already comes as a M-F sockets. Some magnets (I'd recommend something bigger than 1/4 in) would help in securing the model.
Try googling "necron pylon unassembled" for some images.