I just realised something: the size of rm3d is more equivalent / closer to Alpa Max rather than the Alpa TC with a grip, and so would the weight be. The Alpa STC will be closer to the RM2d I suppose, even though the Max has no tilt either.
Weight:
Alpa STC: 600g (without grip)
Alpa Max: 1180g
RM3d: 1150g
Dimensions:
Alpa STC: Size (body only): 134 mm (H) x 145 mm (W)
Alpa Max: W: 177 mm, H: 206 mm, D: 31 mm
RM3d: Length 185 mm, Height 200 mm, Depth 40 mm
It seems that either way I'll have to get more fit in order to carry all these gears while hiking!
Gosh it's hard without seeing and touching things physically including the lenses.
I also noticed the Alpa STC and MAX have 18mm horizontal shift either way, vs rm3d of 15mm either way. I guess it means the Alpa is 'better' i.e. gives me more pano stitching coverage, unless if I get a rotaslide.
Does the rotaslide have special pano positions / notches where it would click (center, left, right) for stitching?