The Neo Max is a big old beast and it doesnt fit into a standard Ikea Lack enclosure, take a look at my Neo Max enclosure build starting out using the Lack tables from Ikea. Perhaps it will give you some ideas how to build a custom enclosure for your Neo Max.
Table is found here https://www.ikea.com/gb/en/p/lack-cof...
Brackets are found here https://www.screwfix.com/p/stretcher-...
Hinges are here https://www.crealitycloud.com/model-d...
Console is here https://www.printables.com/model/2883...
12v power supply https://www.ebay.co.uk/itm/2041757076...
https://www.ebay.co.uk/itm/3350845256...