The CIOS report the drawings are from provides a nice background;
The Bayonne factory had virtually all of its material seized by the Germans and either sent away for scrap or, in the case of instruments, stored or sent to other factories. For a time the factory made electric cars (?!? some British term I'm not getting?), gas generators and other such work until the SNCASO office sent an order for Fw-190 wing tips in April '41.
The order for 144 production was handed down in August of 1942 by the Paris office, with Blohm himself present during the contract negotiations. Blohm sent an engineer for residence at the factory along with three or four other employees for overseeing the work. Some jigs and tooling was supplied to the Bayonne factory by the Germans but many items needed to be produced by the firm itself. Lack of material delayed production of the 144 and in particular the French noted a major delay in material from Blohm after the bombing of Hamburg.
The firm at the factory entertained more than 50 special commisions sent by the Germans during the course of the occupation. They had the impression that B&V wanted to take over complete control of the plant. Junkers was also subcontracting work to this plant and was in constant argument with Blohm over capacity allocation.
On the 20th of August 1944 a French underground group made up mostly of the factories workers seized the plant to prevent the Germans from destroying two 144s. By the time the allied technical mission arrived the first prototype was crated and ready for transport to Toulouse for flight testing, the second was nearly complete. Neither had flown at that time and the French were skeptical of the variable incidence wing as trouble with the jacks seizing was expected (unclear if they just expected this or encountered this in testing)
Other neat details
The prototypes had variable incidence tails, this was not planned for production
Wing and tail use hot air for deicing, this was a feature of interest to the British investigating the aircraft
The tubular spar of the main wing is thicker at the top than the bottom, 8 vs 5mm and 6 vs 4mm.
This spar is also thickest at the wing root with it decreasing in diameter to the center-line - this is for headroom in the cabin
All fuel and oil was stored in the spar
The gap between the wing and fuselage uses a brush seal
"the control column is arranged to move in and out of the instrument board" - telescoping wheel?
Ailerons droop with the flaps
Electric motors could vary the throw of the elevator and rudder in flight