Was building on the Shattered Skies server and just dropping it by if it has remained undetected;
When using Paste Mode, any existing Build Helper highlight areas will centre on the block click to place. Without uploading a GIF to show, here's some reproduction steps:
1) Load a Ship or place down a ship core,
2) Copy a single block off the vessel
3) Place down any Build Helper in a notable position, IE, Torus at 2 x 2 x 0 on the sliders
4) Select paste mode, and paste that single block into another notable position. The Build Helper should recentre on the Pasted Block.
Have thus far tested on a Titan-class WIP and a Ship core with 4 shield capacitors to buffer between the core and where the BuildHelper will go. Both times the Helper recentres on the newly pasted block.