OK, I've got my first profile, a Katana V2 46, under the wing hatches are these big cavities. HOW in the world do ya mount the electronics so they don't go crashing thru the sheeting on the first bump, and HOW am I supposed to have the flexibility to adjust the cg b4 permanently mounting them?[sm=bananahead.gif] I thinking about some kinda rail/tray thing. I thought this was an ARF?

Well.... yes it is a ARF.
Wrap your RX in foam and use velcro to attach it to the sheeting,I usualy mount mine close to the root rib so that there is also still room for the bat in the same hatch area.
Then, again with velcro run a long strip on the sheeting, use this strip to mount the bat with(again,wraped in foam) This will allow you to move the bat. to "fine tune" the CG.
If you haven't mounted the engine yet, after you mount all the radio gear, use rubber bands to hold it to the mounting rails where you think it should be, check the CG and adjust the mounting position as needed. This way you can usualy get things very,very close w/o have to add weight.
Most profiles actualy have a very wide CG range, Get everything close to the starting point in the manual, go fly and trim the plane for "hands off" level flight at @ 1/2 to 3/4 throttle. roll inverted and see what it does, if it dives hard then the CG needs moved back. If it climbs then the CG is to far back. Some people like just a lil back pressure on the stick when inverted, others trim them so they are "netrual" both upright and inverted. at that point it is a personal kinda thing. Hope this helps.

PlanePlanter,
Thanks for the advice. I will do what you described. My first impression was not to mount to the sheeting directly because it seems too delicate, but I have no experience to suggest otherwise, being more familiar with fatties having a nice tray to mount everything on. I'm looking forward to enjoying the experience of profile planes once I get over the familiarization.
-Harrykats