Lol an IKEA kitchen now a bit bigger than that is 10k€ without placement and composite counters and no floor. Prices have over doubled in the past 5 years. + floor and actual stone countertop is easily 15k
We are renovating our entire house and doing everything except pouring concrete slabs and our tile roof ourselves and the kitchen this big + and island is 15k€ at good value places, slightly better places are 25k+ with placement.
5k is an absolute pipe dream. Wholesale materials alone without appliances would be around 9k (assuming decent quality cupboards and real stone)
You seem to be under the impression that Roku and Chromecast don’t do the exact same things.
There is no good solution because connecting a Pi or something is not as good as modern TVs without an AV1 decoder and it also doesn’t have a good remote interface as far as I know.