I am a bit skeptical and afraid that you might be sugarcoating it or twisting it in your head to be nicer than it is... no offense meant.
We have budgeted 630 € per month just for cars (an older car), insurances (we are rather underinsured), property tax, electricity, additional costs, telephone & internet, GEZ and copying costs. That leaves you 870 € for 3 people for food, clothing, toiletries, vacation, gifts, pocket money, furniture, class trips, excursions, bicycles, household appliances... With the 1000 € reserve it’s certainly doable; if that is already secretly planned for special repayments, then not.
Again about the kitchen: 3 T€ huge kitchen from Nobilia including appliances, assembly and delivery sounds interesting – maybe feasible as an offer? Fridge freezer 250 €, oven including cooktop 300 €, extractor hood 100 €, sink with faucet 100 €, dishwasher 200 € makes 950 € for the appliances, 550 € for delivery and assembly, leaving 1500 € for furniture and countertop. Flooring and painting might work.
What about outdoor facilities? Mailbox, carport, paving work, terrace, rainwater cistern, drainage (?), sewage, house connections, garden shed all included? At 2560 € / sqm probably yes.