Well, Ian, my first impressions on seeing the photo...the result is absolutely gorgeous and fully worthy of the rest of the bike! It looks lean, integrated, and every bit as sporty as before. If anything, the motor looks like a SON dynohub that is a little oversize.
I can't begin to tell you how much your post delighted me. So many people I know are in like situation, longing to ride but unable to at previous levels. This is a tremendous "equalizer", making it possible to recapture the joy at being in the saddle once again.
I've been in dire straits healthwise in the past and feared I might not be able to continue riding. Fortunately, I recovered, but I never forgot the spectre and realize it might happen again someday -- and that's true for any of us (best wishes your way, hoping for better days). Electrification is a real godsend when you need it.
how best to use the throttle in conjunction with the gears so that I am still doing some work - I don't want a moped.
Yes, yes, yes! That is the ideal, but even if it came to mopeding...you're still out and about on your bike, and that counts for so much.
...the motor fouls the lower mudguard boss on the right hand side of the fork...
<nods> Yes, it should be easy to trim the inside of the boss, as it isn't really necessary to purpose and a slight reduction should do no harm so long as the blade remains un-nicked (you won't have any trouble) and it is repainted (as I know you will). You may wish to consider using a repurposed faucet valve seat cutter to fly-cut and reduce the inner surface of the boss. I've done that on some of my bosses on frames I've made. Works a little like facing a bottom bracket or head tube, but on small scale.
As for uploading a larger photo, I usually just link and co-host it with the post. To do so, when making a post just click on the blue "Additional Options..." link at the lower-left corner of the page. Once there, click on the "Browse" button and navigate to where your photo is stored on your computer. The server allow a maximum of 5 attachments per post, totaling 512KB. Most photos need to be resized to get under that limit, so you'll need an image resizer. If you're running Windows, there are some nice free resizers that integrate with the right-click context menu:http://windows.microsoft.com/en-us/windows/downloads/windows-xp?T1=PThttp://arstechnica.com/information-technology/2009/09/imageresizer-powertoy-rewritten-to-work-on-vista-windows-7/http://imageresizer.codeplex.com/
Other OSs have their own resizers, or you can reduce picture size in a standalone graphics editor. I often combine my photos into a .PNG collage, then convert to .JPG and resize from there, allowing me to post 4-5 decent-sized photos in the space of one.
Looking forward to reading and seeing more of your wonderful conversion, Ian.
Best wishes for safe, happy travel,