A metal winged He-162 with HeS011 and drop tanks would have been an excellent fighter, agreed. The metal wing was already on the drawing board in nov. 44 but canceled because of the delaying factor. Drop tanks could be fitted under the wingtips, increasing the endurance at sea level to around one hour at 100%. The extra weight of engine and wing could counter the recoilforces of the MK 108 but I don´t think it would have been an ideal fighter´s layout. Three MG 151/20 were still in the limits of the original design and I expect that this would be excellent for it´s role.
And I have to underline that the jet engine of the He-162 was, compared to it´s standarts, a reliable jet powerplant. Don´t mix it with a Jumo-004.
The spoolup time was shorter, it wasn´t that sensitive to throttle setting changes, it even could sustain a 115% overrew for at least 30 sec. (tested up to two minutes but for the cost of average lifetime)! Not to mention it´s much higher average lifetime (200 hours compared to 25-50 for the Jumo-004). It wasn´t that prone to flamouts at full acceleration, it had a superior high altitude behavior and even less specific fuel consumption. I would also like to point out that it weights nearly 200 Kg less than a Jumo-004 (dry).
We don´t know if the HeS011 would make it to a reliable powerplant, testbenched examples showed a wide field of complications (spool up time, feul consumption, high alt effectiveness), the only example to fly under a He-111 showed no malfunctions but decent tests are missing.
The Vampire is great, I simply lack in detailed knowledge but would be grateful if anyone can provide some interesting links.
Originally I had the Supermarine Ace or something comparable in mind. Ideas?