Is that really worth it, though? The 13 inch screen from this company is 899€ and already comes in a proper enclosure, and is wireless which seems important for this product. If your goal is to quickly manufacture reliable devices, partnering with someone that already sells a proper device seems totally worth the extra cost.
Not to mention that OP wants a big poster-size screen, so your suggestion comes a few inches short.
Not to mention that OP wants a big poster-size screen, so your suggestion comes a few inches short.