Nice pictures,sorry I only have old pictures of mine,must get a new camera.Wish I could put some closeups on for you.

Yes the clip in picture one will need removing to fit the dual drive. You can also opt to use a 3X9 with out the clickbox,as the older picture of mine shows,but either way this has to go. I planned initially to move it to the pannier? hole that you can see above the wheel bolt. This does not quite workout. I have mentioned how I secure the fold in my earlier post. It is not ideal ,if you have any better ideas I would be very interested. Latest thought is a julibee clip with a hook or simular to secure the QR. To be honest I am too busy enjojing the bike to worry about it. It gets folded around 10 times a day and it makes little difference to me, its a slightly smaller ,but less securely locked package done this way. I use the bars to help secure the front wheel in place also. I do not need to use a bungee or strap, but it may be preferable if other people handle your bike.

If you use the click box then you need to remove the cover, (this makes the box a bit smaller and does not alter its function).One removes a single screw,from memory. I run a click box on my black bullbar3X9 and a toggle chain through a SA wheel bolt on the gold 3X7 bike. The click box is a bit smoother.

Couple of more hints ;
1. Telon cables best on a MEzzo Upgrade the rear brake and see what I mean. Allow plenty of length. Possibly use tandem if you want to be sure I will measure mine for you if you want.
2. when inserting the innercable you may find it easier to fold the bike slighty to get round the botttom bracket. General MEzzo hint anyway.
3. Around the bottom bracket area you will need to secure the extra cable to either one of the rear cables so that it keeps to one side when folding. Else the seat post tube can not go in.Couple of plastic ties does the job fine.
4. You may need to adjust the cone shaped spacer that sits at the back of the void behind the BB.I replaced mine with a screw.

The conversion should be easy now you know the things to watch out for!

ps It's great to speak some Mezzo upgrading.

Questions for you;
1. why did you choose not to use the rack mount for your rear light instead?
2.is that a cordless computer? What make is it?
3. do the rollerblade wheels get in the way of sliding the Mezzo bag on? whats the spacer made from?
4. Ever thought of puting a wheel on the front mudguard instead of a foot?

thanks