Yes, Konstantin Feoktistov flew on Voskhod 1 which he had helped build as an member of Korolev's design bureau. Flying a civilian engineer rather than a military pilot was a political decision by Korolev, and the Russian Space Agency heralded the flight as follows

The expedition made Mr Feoktistov the first spacecraft designer to have tested his brainchild under real conditions.

This mission was remarkable for the fact that it involved three men in space in one spacecraft. In order to achieve this so much weight had to be saved that the cosmonauts could not even wear spacesuits.

Notably, Feoktistov was part of the two cosmonaut party that visited the US as guests of NASA in the 1960s. They interacted extensively with their American counterparts, including Gene Cernan who mentioned this episode in his book Last Man on the Moon. Interestingly, in an illustration of common stereotypes Cernan described Feoktistov as a "thin, wimpy engineer" in contrast to the "jolly bear of a man" Georgy Beregovoy who was a fellow military pilot rather than spacecraft engineer.

Yes, Konstantin Feoktistov flew on Voskhod 1 which he had helped build as an member of Korolev's design bureau. Flying a civilian engineer rather than a military pilot was a political decision by Korolev, and the Russian Space Agency heralded the flight as follows

The expedition made Mr Feoktistov the first spacecraft designer to have tested his brainchild under real conditions.

This mission was remarkable for the fact that it involved for the first time three men in space in one spacecraft. Which made for such a crammed capsule that the cosmonauts could not even wear spacesuits. A "courageous" gamble with great danger as evidenced by the fatal depressurizing of Soyuz 11 a few years later.

Notably, Feoktistov was part of the two cosmonaut party that visited the US as guests of NASA in the 1960s. They interacted extensively with their American counterparts, including Gene Cernan who mentioned this episode in his book Last Man on the Moon. Interestingly, in an illustration of common stereotypes Cernan described Feoktistov as a "thin, wimpy engineer" in contrast to the "jolly bear of a man" Georgy Beregovoy who was a fellow military pilot rather than spacecraft engineer.

Yes, Konstantin Feoktistov flew on Voskhod 1 which he had helped build as an member of Korolev's design bureau. Apparently, to fly a civilian engineer rather than a military pilot was a political decision by Korolev: "Sergei Korolev wanted his engineers to become cosmonauts, believing that spacecraft designers should fly in their own vehicles."

This mission was remarkable for the fact that it involved three men in space in one spacecraft. In order to achieve this so much weight had to be saved that the cosmonauts could not even wear spacesuits.

Notably, Feoktistov was part of the two cosmonaut party that visited the US as guests of NASA. They interacted extensively with their American counterparts, including Gene Cernan who mentioned this episode in his book Last Man on the Moon. Interestingly, in an illustration of common stereotypes Cernan described Feoktistov as a "thin, wimpy engineer" in contrast to the "jolly bear of a man" Georgy Beregovoy who was a fellow military pilot rather than spacecraft engineer.

Yes, Konstantin Feoktistov flew on Voskhod 1 which he had helped build as an member of Korolev's design bureau. Flying a civilian engineer rather than a military pilot was a political decision by Korolev, and the Russian Space Agency heralded the flight as follows

The expedition made Mr Feoktistov the first spacecraft designer to have tested his brainchild under real conditions.

This mission was remarkable for the fact that it involved three men in space in one spacecraft. In order to achieve this so much weight had to be saved that the cosmonauts could not even wear spacesuits.

Notably, Feoktistov was part of the two cosmonaut party that visited the US as guests of NASA in the 1960s. They interacted extensively with their American counterparts, including Gene Cernan who mentioned this episode in his book Last Man on the Moon. Interestingly, in an illustration of common stereotypes Cernan described Feoktistov as a "thin, wimpy engineer" in contrast to the "jolly bear of a man" Georgy Beregovoy who was a fellow military pilot rather than spacecraft engineer.