Handlebar bag mounting...
Your strategy seems sound, c$c; should work well.
Dan - angle of mounting, noted, sounds like a good idea indeed, will make for some interesting eye-balling with the suss fork sag :-) . Any special considerations with the thorn accessory bar? We're not carrying front lights, will use our Petzl headlamps if we really had to.
As for angle, that's easy -- just mirror the angle of the head tube, forgetting about sus-fork preload. In the photo attached below, you'll see how my loaded handlebar bag rides level, though unladen it matched the head tube angle. Had I mounted it level when unladen, it would have sagged when loaded within Ortlieb's recommendations.
As for special considerations with the Thorn Accessory T-bar...I installed my Ortlieb bracket on the Sherpa's and the Nomad's T-bar as I would on a handlebar/stem setup without incident. However, SJS Cycles do note the cable should be wrapped several times 'round the junction of the T-bar and this is shown in a photo on the SJS Cycles website here:
http://www.sjscycles.co.uk/thorn-accessory-bar-t-shaped-105-mm-extension-0-deg-prod11040/I used the 105mm T-bar on Sherpa's 560S frame, but chose to go with the shorter-reach 55mm T-bar on the Nomad, which as a 590M has a longer top tube requiring me to use a shorter-reach handlebar stem. Things came together fine in this particular instance and I was able to use the shorter T-bar to put the weight of the handlebar bag closer to the steering axis for better handling. Not always possible, but a tip offered in the spirit of helpfulness.
Ah, and one more: cinch cords to secure rear panniers plus Ortlieb rack bag- how many? One per bag, i.e. 3, and then around the waist of each bag/the corresponding rack part? Dan - you have photos?
Sure do; see the one attached below. I use a single cinch strap vertically 'round each bag *and rack* to secure the bags to the racks so they work as a single unit. My Packer-series rear bags already have lateral cinch straps, but those only secure the bag-stiffeners, whereas my additional cinch-straps secure the bags to the racks as well.
If I'm parking the bike where I am concerned about a bag-snatching, I slide the q/r buckles to the underside of the bags where they aren't so readily visible and also employ the Ortlieb anti-theft tethers, fastening them together through the wheels with a small luggage padlock front and rear.
I do have to remove each cinch-strap q/r buckle the first time to feed the webbing through the lower mount of the rear Thorn Expedition rack, but once done they stay on the bike without incident, and you can see them in the neatly snapped 'round the crossbars in the second photo.
On different panniers used on another bike (attached in the next post to keep within upload limits), I have sometimes used cinch straps laterally as well as vertically, but
just one cinch strap run vertically 'round each pannier should be sufficient for most needs.
Best,
Dan.