First, I would use a proven system such as (Stits) Polyfiber.
http://www.polyfiber.com

Here is what they say (in the Tech Questions portion of their website)...

When gluing fabric to fabric, how much overlap should I use?
Normally, a 1-inch overlap is sufficient. However, on the leading edge
of any wing section you must use a 2-inch overlap.

I don't believe you would have to sew the upper and lower coverings
together at the leading edge (and as I recall, the leading edge tube on
the Riser is something like 2" in diamter, so you should have plenty of
area to get a full 2" overlap and still even have metal under the lap to
really hold the fabric on). This IS assuming you use polyfiber and NOT
jacket lining material! I'm familiar with the Easy Riser. You only
have 4 wing panels and 2 rudders to cover. I would pay a little extra
and use industry standard materials. Plus, if you use a complete system
such as polyfiber, you won't have any compatibility issues. I'm sure
you would hate to find out that the glue you used to attach the fabric
eats the fabric away after 6 months, which would no doubt be discovered
at 200 feet during your climbout....

Definitely check out the polyfiber website!!

Good luck with the project! It would be great to see that vintage
ultralight stuff still flying!

Scott


Chris Wells wrote:

I'm using thin polyster fabric on my Easy Riser, and the old fabric was
sewn together at the leading edge. The trailing edge was just glued to
the frame.
Can I simply glue the leading edge tubes to the fabric, as well as
the trailing edge? If sewing is necessary, how do you get two 16'
sections of coat lining material sewn together?