I actually built up the Season 7 Geordi PADD that you have pictured above. Also the Neelix PADD you referred to. For my scratch builds I cut the raised front details and glued them in place using cyanoacrylate.
For where those raised details bend around the sides, I cut pieces separate from their front-facing counterparts, butted the edges up against one another and after gluing simply rounded out that seam.
If necessary, I used a bit of putty to fill in any gaps in the seams, primered then painted. So it looks like they’re a single piece that wraps around the edge, but in fact were two separate pieces shaped to look that way.
Looks just fine, imho. Here’s a few WiP pics that I hope show what I mean: