is this what you want?

As you have unfold the inner shape make a copy of it, find the outer curve length and scale the copy to fit this length.

NOTES:
as SU draw segments not real curves you may have to calculate the real length by hand.
as you want to make accurate product I would draw the shape flat then bend it.

Of course.

@unknownuser said:

There is a basic "rule" here: no-one should re-share others' plugins so that's why it's not included in the zip file.

Is there a reason to this?
Just to know.

For this kind of job I use Unfold.rb.
http://sketchuptips.blogspot.com/2007/08/plugin-unfoldrb.html
Make your shape without thickness and turn on hidden geometry.

You can try Recurve plugin; select one segment right click, choose recurve in context menu, choose your option.

Note than it built or rebuilt curves so a exploded arc will be rebuilt as a curve not an arc.

http://www.sketchucation.com/forums/viewtopic.php?f=323&t=36822&sid=cd5f666daadc6a9c70ffcfd0feecdb67#p324196

Welcome here.

@unknownuser said:

Ok, I would like to know how to make "chains"..i am trying to make a lamp with a "hook" on top and that hangs the "lantern" by chains.

http://forums.sketchucation.com/viewtopic.php?t=23616

@unknownuser said:

Oh, and learning on how to bend a shaft to make a hook was be awesome too.

http://forums.sketchucation.com/viewtopic.php?t=18210

@unknownuser said:

Also, i know about the fillet feature, but is there a way to "round" a side angle? For example, if i am trying to make the sides of a mattress, i want that to be round and not at a 90 degree angle.

http://forums.sketchucation.com/viewtopic.php?t=20485

Have a good day.

this one can be useful too.
http://forums.sketchucation.com/viewtopic.php?t=2102#p10503

choose hole in solid in plugin, select a solid, then select a face.
done.

On Mac it's Alt key.

Very smart!

You should post your model if you want someone to help you.

Yes they are.
Select a white face, right click choose orient faces in context menu.

@unknownuser said:

It looks great!!! Could you please tell us which plugins you used.

It can be done without any plugin.

Un peu tiré par les cheveux...

Have a look there.
http://forums.sketchucation.com/viewtopic.php?t=33908#p298004

I'm stuck with the extra lap.I'll give it a try later.

Paste zorro2.rb in the plugins folder, restart SU then you will find it in tools window not in plugins window.