Looks good DB, I am not sure what it is but it does look like you have taken a lot of time designing and having it cut out.
Are you going to let me in on what it is?

As for if the join/s are visible once bonded.
The short answer is yes and no.
But do you ever get a short story from me, not yet!

Solvent cement (ONLY When joining square, tight fitting "perfect" joins) uses capillary action to draw the solvent cement along the join.
In this action (when horizontal) it will only move between tight fitting joins and will only take as much solvent cement as there is room for.
One the join is "Full" it will stop seeping (being drawn along the joint) into the joint and start to pool. It is at this point you need to stop.
As solvent cement is a solvent, it works by melting the perspex together, henc why it is often called welding cement.
As to being "visible" when dry, because it melts the perspex it will make clear perspex slightly cloudy, but only where the solvent cement has been.
Between the joints you will not notice it as it is only between over lapping surfaces.
It truly is the most outstanding way to join perspex.
Using a syringe to apply the solvent gives you excellent control over how much you apply, also heaps less mess to clean up.
Have a look at this, a XS member, Rise, gave me the link to voigts work log, his guide will help make sence of it all.
http://www.xtremesystems.org/forums/...=225441&page=2

Try looking at the place you bought your perspex, they should either have it in stock or know where to get it.
I think you can also buy it online from the link I gave you, not sure but

Have fun mate.