You are basically describing , a Kodak K16 processor which we used in 1973 for processing colour prints.

K16 - was a smooth smooth drum, it had a tray in front of the drum at waist height, which accepted the chemicals and when you lifted the chems fell
into the wash out tray.
Beside the drum system was a large tray with a large mesh and two metal snaps that would hold onto the drum system.
by presoaking the exposed paper, and preheating all the chemicals all you did was turn on the timer and the drum rotation.
lift up the hangers and mesh and put the print face down on the drum.. Yes face down.. pour in chem and time.. dump and pour in second chem and so on.

Worked fantastic.

Calumet basket system- I used this as well

Calumet nitrogen basket system was a large mesh paper holder that had nitrogen burst on bottom( it had slots to put more than one print in at a time).. the tank holding the paper holder would have five ports where you insert the traveling paper holder into preheated chemical and water baths. the nitrogen burst would supply the agitation and you would move from tank to tank till you are finished.
With two or more paper holders you would be able to do continuous runs. Finish one run , take out prints to dryer, dry basket , load new basket - process.

These two systems were in my darkrooms at school and I used them for three years with wonderful results... the first hope RA4 roller transport
processor was installed the year after I left, I never felt I was cheated by using the K 16 and Calumet methods.

I liked using both methods, if I was setting up at home to do colour RA4 small I would use the K-16 method for sure , very compact and consistent.
up to 16 x20 print size.
For larger prints or more volumne I would use the Calumet Basket system.

But for large murals you are suggesting I would make my life easy and use some of the methods described above.

Quote Originally Posted by lhaumann View Post
Thank you also Ian and Greg - inspirational and some topics to look for!

I am wondering, if anybody has worked along the following lines:

1. You secure each end of the FB paper between two thin rails of metal, PVS or something.

2. Paper is laid around the OUTside of a cylinder/drum/tube of appropriate diameter, one to two feet according to paper format, so the rails allmost reach each other. These are then connected with rubber bands so the paper is only gently stretched. Of course, emulsion side outwards.

3. The cylinder has a central axis and is now placed in a slightly larger halftube, with or without the other half as lid, the axis resting in slits in the end plates of the outer halftube. Developer poured in, and the paper now rotated like a chicken/pig/ox in a grill. Weight of inner drum addjusted to keep it down in the developer even when this is pressed up between paper and outer tube.

4. Additionally, axis at each end can be liftet to get the paper out of developer. And while still slowly rotating, helper or motor, (so developer will not accumulate downwards along the same line across the paper) you can add slight modification to the proces with a cold or warm sponge with water or concentrated developer.

5. Same outfit with appropriate modification for stop, fix, and wash.

Sure will demand some floorspace, with that provided however, would seem to give good control of the proces.

Could, with modifications, be scaled down as well, if someone likes closed tanks.

So, as mrs. Wilberforce says to Alec Guiness in "The Ladykillers": 'That is such a nice thought, I wish someone has expressed it.' Meaning here, this has proberbly been done, have you heard of pro's and con's??