On the helicoidal mounts, it seems quite cost effective to have lenses mounted by Silvestri.
They charge £300 per lens. That includes the helicoidal mount and a Silvestri bayonet fitting. They also quoted for fitting a linhof lens board with the female bayonet fitting for about £100 labour + any components needed.
This also has the possible advantage of compatibility with the Silvestri system.
Further thoughts :
With the Schneider 24mm lens the distance from the rear of the lens to the focussing plane is only 12mm or 10mm! (depends on shutter, but Schneider don't quote this for the bulkier copal shutter only for electronic shutters). As this distance is less than the focus depth of the Kapture sliding back, I don't think that this lens would be viable with a sliding back as the lens end would need to nestle inside the sliding adapter. But it might be OK if you focussed on a GG and then replaced with a mounted back with no sliding adapter. Or possibly you could use infinity focussing a la the Cambo Wide DS once you had your back adapter shimmed correctly.
With the Schneider 35 or Rodenstock 35, the distance is either 24mm (Schneider) or 18mm (Rodenstock) hence these lenses could be used with a standard view camera set up... with the Schneider at a slight advantage in flexibility but with a smaller image circle. The Rodenstock would barely work with the KG adapter given the adapters 17.95mm focal depth.
Note that with the KG adapter and the 35mm lens you could get a stitched image 48x72mm (Portrait stitch). This gives a similar angle of view to an 18mm lens (35mm equivalent) according to my calculations based on Andre Oldani's lens calculation spreadsheet (see www.alpa.ch
). A 24mm lens on a 36x48mm sensor gives a similar angle of view to a 17mm lens (35mm equivalent). Therefore the 24mm doesn't buy much advantage if you are prepared to stitch images with the 35mm lens. The only downside is the extra post work and the longer camera to subject distance involved with the stitching option. Having the 24mm might provide a "get out of jail free card" for some tight spots though, I'd find access to one pretty essential for many interiors scenarios.
Gradually I am being pushed towards the Cambo Wide solution... I think it's one of the few cameras today that allows both mounting the 24XL and stitching with a 35mm lens at a price affordable by a working professional rather than a corporate lawyer.
View cameras cannot mount the 24XL at all.
Cambo Wide DS allows X/Y stitching, in both portrait and landscape orientation
Silvestri Bicam can mount both but cannot stitch (yet).
Alpa SWx can mount both, and I don't know about stitching.
Alpa XY will do anything to space science precision... at prices suitable for ESA and NASA?
There are a few smaller, custom manufacturers... but what about support?