GJE, don't get me wrong, nor feel flamed by the following.
I can't share that large difference, structural related questioning, simply by the term that the two seaters, with or without antennas where
both the same conversions from Blohm und Voss, Wenzendorf/Hamburg or DLH-Deutsche Lufthansa, Berlin/Staaken.
I can't recall any serious Me 262 related publication, claiming structural differences,
but I've seen bad reproduction fictional 3-way Profiles arousing. The source of them where in cheap publications or artists,
who failed to read before intially redraw sth. that didn't existed in that form.
It is better to say the Two-seaters are conversions from single seaters, which they literally where.
Factory fresh Me262 A series delivered directly to Staaken or Wenzendorf, that proceeded in
these modifications. Before the installation of the nightfighting equipment, these kites were Test-Flown, i.e. by famous Beate Uhse,
her and other Lufthansa Pilots testimonials, as well as footages, documents don't mention the structural changes you speak of.
The access panels, number of fuselage sections modified were the same.
Simply ask CirX about the history of conversion on the south african Ursel, her history matches a preserved Trainer, if in existence, the bolting and riveting,
may vary, due to the disastrous working conditions. Cramped over with filling, tape, harsh structure,
it was everything else than tailors work from the bench, as the initial pre-production development.
But calling instrument equipment related things completely worth to start from scratch, I think is a bit overrated,
when historically it needs just removal of the instruments and a simpler 2nd cockpit, nothing less.
The FuG and Antenna installations are not worth being called structural, we have hundreds of Mods with such tiny 3-D differences.
If the author failed to give Credit, that's a Prob, but if he did, I don't see your Problem yet.
I can prove that I don't speak of a theory but recored/preserved data I share with you here:
A good source to start is Dan O' Connells "Me262 The Production Log"
We take a peak at a B-1a/U1, Werkenummer 110306, the following archival sources where used
aau/abj authors Communications with Karl Rentschler
akt authors correspondence with Eddie Creek
Erprobungsbericht Nr.53
110306 was a conversion by Blohm und Voss, Wenzendorf/Hamburg
interestingly being previously used as a Trainer by III./EJG2 dated to 28. Dec. 1944
The doubleseaters were from allover the various production blogs, not specificly related to a
"trainer" or "nightfighter" Block, as one may suggest first.
But glad this forgotten and partially historic Mod is back here, even if it is not
build from scratch, it may be for joy and fun to others.
Note on further 3-D Pimpin to get a polished Trainer.
Use PA_Jeronimos Updated Me262 Nightfighter Wheels, engine meshes/Blisters etc. take care to load everything before anything else and
get rid of the nightfighterequipment if necessary in hier (so for Crazyflaks flame start up fx and Jeros hier-him files).
If you're completely in love, you can pimp it it up with Greifs new Pit texture, partially meshes where possible.
That should be enough to get a bit beauty out of it.
Do at your own risk:
If you want loadout as the Ursula, do a simple Reverse engineering on the TPF,
I for myself had no use for it, but wanted a historically armed Trainer
(4xCannons + Droptanks recorded in wartime pics and documents),
hence I turned TPF into a fully working Ursula, as it the base of Modding achieved there.
Java Errors, CTDs, doubled loadouts etc. I couldn't trace so far...
The trick lies in the combination and use of a single Classfile from TPF,
35A7C61242163F46 containing the loadouts and slot, I use the Trainer Classfiles for the rest,
Plane Cockpit adjusted to turn TPF into Trainer.
Kind Regards
Tobias