Thank you very mush
SHΔRD Aerospace, that is really awesome!
I very much like doing maximum efficiency rockets, which are 100% without clipping, 100% without any cheating, and 100% without any BP editing or parts editing or custom parts.
And inability to make parts move by half of small square was very big limitation and prevented many interesting high efficiency ideas. Now i can do that with your method. And now you even showed how to make 7-wide fuel tanks, i can find where i could squeeze it too!
Plus I am sure we can find a way to move other rocket parts by half small square, not only Valiant engine and things which can be attacked to it. Plus there is one more interesting implementation of your discovery:
View attachment 101934
Look at the arrow - i can go off the grid a little without any cheats or any BP editing or infinite building area. This allows to squeze more fuel into the launcher. But my way (above the arrow) did only X.8 wide tanks, so it is 4.8, 6.8, 8.8, 10.8, 12.8 and 14.8 wide fuel tanks, while your way allows also 7 wide tanks and editor accepts it been off the grid. That extra width goes off the grid and allows to add some more tons of fuel to the big rocket, since now it is 0.5 off width off the grid instead of 0.4 as i had before.
Here is another nice trick i found:
View attachment 101935
Left side is before connecting lower piece from below, right side is after connecting it.
And now you can do tower cones at the upper and of your fuel towers beyond blurprint grid, making the fuel tanks up to the last square, instead of wasting last upper squares for cones.
If your rocket design permits, you can use smaller cones to not waste extra weight for too big cones above grid, because you can't put anything inside that off-the-grid space anyway:
View attachment 101936