An alternative to using metal letters would be to have 5mm thick silver acrylic letters.
![](http://metalletters.co.uk/wp-content/uploads/2019/03/small-silver-acrylic-lettering-1-600x543.jpg)
We produced some Small silver acrylic letters for a customer to use as a house name sign. I believe the customer glued the letters onto a hardwood base using epoxy resin.