1999 te610e sm

New owner of a 1999 Husky 610SM!

I have been directed to this site by someone on Thumpertalk as I am looking to convert SM to E. I bought the bike with spare E wheels (18/21) and am in the process of converting (done the front wheel).
I do however have a couple of questions regarding the swith and any help greatly appreciated.
Already overcome the front brake caliper mount by using SM brake disc. I know this will mean severe braking off road but in reality I am only using it for occasional green laning and some street riding (to get to the green laning!)
Question 1
Current SM gearing is 16/45 and I have a spare 15/48 sprocket , which would be a good compromise for E spec allowing for the bigger wheel circumference?
Question 2
The previous owner apparently had the bike lowered (i think rear shock only). I have found somewhere who will service the shock and put back to standard but my question is does anyone know the approx floor to seat hieght of an E bike for me to use as a guide?
Question 3
there is no chain guide on SM set up but have been given one. Do I need to fit it even though I am not going to be doing hard core off roading!
Sorry for the questions, bit of a newbie!

nice buy. I have a 99 te610e but i dont know the answers to your questions. Just thought id say hi.