How about a project ?

I'd love to do this.  Ollie, Clem and I did a couple of collaborations last years and it was great fun.
We each produced our own masters (L, Ha, Oiii, R, G, B, whatever) then integrated them.  A couple of us had data/masters from two separate scopes so we'd be integrating 5 masters.  We used Ollie's google drive account I think - I'm not really too good at that techie kind of thing.
The Abell 85 and the Jellyfish nebulae were done with them.
Ideally, combining the subs for one integration would be better I guess, but I've no idea how to share so much data easily.

Sounds like a good idea just need to decide which target

Abdul Thomas Jnr:
Sounds like a good idea just need to decide which target

Great that you are up for it Abdul ! Any thoughts on a target ? Popular or obscure ? Galaxy or nebula ?

*** We are spoiled for choice in this hobby but maybe something that is not image too often? Maybe like a dark Nebula or reflection Nebula. Something like LDN 1217 or LDN 1235 in Cepheus or NGC 1788 in Orion***

Cheers Abdul 

Apparently it is possible to scale data from scopes of different focal length and different cameras so that it can be integrated together using Pixinsight or some such. I've never done this so this will be part of the fun learning how to do this. Having said this I am guessing that we wouldnt want the focal lenghts to be too diferrent as the details wont be as good at very short focal length . I have got data on the Heart Nebula at 728mm 520mm and 250mm so am going to experiment with this data and see what can be done. There is also the issue that James has mentioned re trying to stack individual subs or not. 

Re targets dark nebula would be cool but I worry about the light pollution making this a thankless task from Leeds

If we each produce separate masters then it's easy to just StarAlign them in PI and then integrate them.  As urmymuse said, it's best if the focal lengths are similar.  If some are shooting in high light pollution, then a dim emission nebula would be most sensible I guess (though, to be clear, I'm happy shooting anything)
Spaghetti neb (SH2-240) is a nice dim one, though may need too short a focal length for some of you

I'd be happy using my Samyang 135mm too, with an ASI2600MC.  I was planning to revisit it this year anyway

I use this.  It's great, cheap and easy, with a zwo filter drawer (plus spacer/extension tubes to get to right back focus) in between the adapter and camera.
Instructions on how to use it are in the description in the link too. 
https://www.firstlightoptics.com/adapters/astro-essentials-samyang-lens-to-m48-adapter.html

And how do I mount it on the star adventurer?

I use this Abz, with any dovetail you like that fits
https://www.ebay.co.uk/itm/185136335492
There are other similar ones on FLO eg the Astrodymium one.  I just fitted an EAF but manual focus is fine (I like the 3D printed Bahtinov mask for focusing)
No idea if the Starizona filter will fit - isn’t that just specifically for a RASA? 
I could use my RedCat too (maybe a 2x1 mosaic to frame ideally) to boost data capture rate, I’ll have to try framing that up