@airdream Yes, you can include the logo perfectly, don't worry. I have tried different sources in the yellow top, and they all work well, including pure black and pure white. (that's why I made it little muted)
Regarding bg2, I have converted it to 720 as you indicate. However, I have seen that the bg2 of the other systems are at 1080, like n64.
I have worked with photoshop, I have the file by layers, if you need it you can ask me and I upload it too.
I upload the corrected files (Original box and Bg2 in 720), so you can check them out and download if you wish.

@airdream Thanks! I'm glad to know that you like it.

Yes, that is the box which I have been inspired. The yellow color is a little muted to facilitate the reading of the source.
The images bg1 and bg2 that I have included in the previous links are both in 1080.
The white fonts can be read perfectly on the yellow top (checked).
I can replace the blue box of psx dual shock with the original, if you wish. Only that it will be from another angle.
For now, I don't have a recalbox configured, but whatever you need don't hesitate to ask me.

@airdream I have taken the liberty to create a psx theme. I have taken as reference the original box of psx (black and yellow) I would like to share it and if you like, you can include it.

@airdream I love this theme, but the wallpaper of playstation game menu seems a bit boring, do you plan to change it? More similar to the original box of psx?