Lads the LCD multi cades are rubbish.
Just get a 2 player 6 button Jamma cab and a pandora's box or even better a neogeo with a multicart.
What about if you're not 100% fussed about true authenticity, and can't be bothered with the labour involved in a build?
I ask because I was looking at a bartop solution, ie
https://www.arcademania.co.uk/product/arcade-machines-defender-2-player-arcade-bartop-machine
Without knowing anything about it, it seems decent, and splashing for the scan line generator would assist a bit in the fakery. Tell me I'm nuts.