Need Help Led sign box, some questions

Hi,
a client of mine wants illuminated from within 900x60cm sign box. After this and that we went to the conclusion to make sign like this:

Now the not so standard thing is the design printed on transparent acrylic from within, where letters are to be - no print. On top of letters go opal white acrylic letters/ 5 or 10mm /say 5mm wider to cover correctly the shape. That 3d letters are to be stuck using 2 sides film used normally for same purpose fabricating acrylic photos/photo paper sandwiched between acrylic sheets.

Basically the idea is during day sign to look shiny as photo is behind 4mm acrylic/ UV printed and when illuminated at night the letters to shine and also the colors imitating neon, see picture.
And at the same time to be a little 3d , not ugly plain sign, hence the 3d letters

What i am thinking if UV print is too much transparent to cut to shape black vinyl and stick at the back on top of UV print, so only colors and letters transmit light

Here is the design




As i normally don't do myself that type of signs, so 0 experience, will that work ok?

Problem is i dont have the capacity to do it and people i am explaining to do not understand what i am saying. Apart from that not sure about how that picture will illuminate from behind, but as i said i can cover it with black vinyl if too much light passes

Any advice welcome, especially UV print and led sign combination, etc.

I wonder also if it could be better al same but letters in sign white and 3d letters Transparent?



Thanks

 

i was thinking of printing them with white base on top of the photo, so it's not super transparent and avoid the translucent piece. As the cut out letters that go on top will be translucent