1) What middleburn cranks do I have. I though RS-3 but the pics I've seen of other sets seem to have RS-3 on the lower arms
They are original RS3s. They modified the design around 95 as too many of them were splitting.
2) I've currently got a UN91 BB in there, is this the right BB for the cranks (it was previously running the M737 cranks). How close should the crank arms be to the frame. I think mine look OK, but has anyone got a pic of their clearance?
You need 113mm. UN91 was also available as 107. There should be approx7-10mm clearance from inside of crank arms to frame. But Pace has assymetric stays so it may not be the same either side.
3) Forks - I'm not 100% sure about the blue arches and fork sides, as it isn't the same as the turquoise ringle colour - thoughts opinions please
Prefer them silver myself.
4) Chain suck device - after moving the individual teeth to different holes, it now looks OK with the 110 BCD chainset, but has anyone got any pics of how it should look/teeth distance from chain rings
No but just run it as close as you can without it rubbing.
5) Mint sauce decal - should I remove?
Yes
6) Forks again - I want a ti stage II bolt kit - any thoughts on where I can get some from?
No
7) More forks - rocker for cantis. I've got a nos kit, but it's nothing like on any other one on my forks - see pic below How does this fit/work?
Fit it as well as you can and we'll tell you how you're doing. It's very hard to explain in writing in a hurry.
They are original RS3s. They modified the design around 95 as too many of them were splitting.
2) I've currently got a UN91 BB in there, is this the right BB for the cranks (it was previously running the M737 cranks). How close should the crank arms be to the frame. I think mine look OK, but has anyone got a pic of their clearance?
You need 113mm. UN91 was also available as 107. There should be approx7-10mm clearance from inside of crank arms to frame. But Pace has assymetric stays so it may not be the same either side.
3) Forks - I'm not 100% sure about the blue arches and fork sides, as it isn't the same as the turquoise ringle colour - thoughts opinions please
Prefer them silver myself.
4) Chain suck device - after moving the individual teeth to different holes, it now looks OK with the 110 BCD chainset, but has anyone got any pics of how it should look/teeth distance from chain rings
No but just run it as close as you can without it rubbing.
5) Mint sauce decal - should I remove?
Yes
6) Forks again - I want a ti stage II bolt kit - any thoughts on where I can get some from?
No
7) More forks - rocker for cantis. I've got a nos kit, but it's nothing like on any other one on my forks - see pic below How does this fit/work?

Fit it as well as you can and we'll tell you how you're doing. It's very hard to explain in writing in a hurry.