I've just completed my first cube mod, a 3x3x5 based on a C4U 3x3x4. This is the bare cube after sanding and polishing:

And this is after stickering:

I used CubeSmith "pastel" tiles just to give it a different look. To get a smooth finish, after glueing I filed along the new joins using a 3-square file so as to open up the join. This meant I could get a better "fill" with the Apoxie Sculpt, which I carefully cut away using a wet razor blade before the Apoxie fully hardened. This made the sanding (medium, fine then ulta fine paper) much easier. The "polishing" was just a qucik rub with a soft cloth.

Considering this is my first attempt I am very pleased with the result. The cube turns well and is very stable, and it does not jam or lock at all. Now for the next one!

You used a 3x3x4??? Then if so you are good at modding!!! I would've used a 3x3x5

- Greg

I prefer the look of the lazyman's 3x3x5 over both the cubic AND the properly proportioned, TBH.

That's very nice. From the looks of it you followed redKB's method. That's exceptionally clean for a first mod. Well done!

Outstanding quality! It looks perfect!
Congratulations of finishing your first mod! What will be the next?

Thanks for the comments guys (or gals)!

For my next mod I was thinking about the Dino Cube (from the Rainbow cube) or Fisher's Mental Block (from the Skewb). I would like to do the Mental Block using a mini (keychain) skewb. Does anyone know if you can still get these puzzles?

They're not mass produced by Meffert's now, so you may have to ask some people from the forum or maybe try eBay.

Thanks SEBUVER. Doubleyou has been in contact and I am buying a mini skewb from him to do the Mental Block.

We are possibly going to cooperate on this build. I plan to use sheet ABS and Apoxie Sculpt to make the pieces. Any hints?

I am glad I could help!

you know I made this thread. it gives a few tips but not much
viewtopic.php?f=9&t=19009

any more help would be highly appreciated! Tony?