The plans and other material can be found on the Epping Forest District Council Planning pages under the reference EPF/2735/17.
Basically the structure is similar to that built at Doncaster, maybe a little smaller. Oddly it only has a jet fuel facility bearing mind it is supposed to be flying the piston fixed wing. On the positive side of that the airfield has plentiful mogas bowsers though available daylight hours only [currently until 7pm].
The press release from NPAS has an error in that it quotes 16 miles from Lippitts Hill to North Weald. I guess North Weald is 16 miles from central London.... where Lippitts Hill was nearer 12 miles and therefore about 5 from North Weald.