@GRS, your submission has been reviewed.
There are three ways reviewing this submission could have gone, rejecting it for craft copying, accepting it no problem, or using it as a learning opportunity.
Your mission, by your own statement was inspired by my own extended grand tour mission. However, there is no doubt that the mission contains drastically to many similarities to my my own, with the only major difference being your launch stage. Shown below are pictures comparing your craft to mine, arranged in pairs with mine above yours.
As seen in this set, the craft used for Gilly is completely identical to mine, minus the fact you used one less fuel tank.
This pair is quite interesting, as they are virtually the exact same screenshot. Note how both of our vessels are comprised of several xenon sections, made of three take segments docked to one another. Similarly, both have a solar panel array mounted on a girder. I wouldn't normally count this as copying since it is an incredibly basic design, but given the other similarities I am inclined to believe you copied this design aspect from my craft as well. Next, there is one of the spherical command pods, followed by large battery arrays, which have 6x symmetry xenon tanks with ion engines on the back. These screenshots alone tell me that your mission is more of a reboot of my own than your own mission, and that alone seems to take away from the mission's supposed grandeur, as most of the components that made the mission possible were copied directly from my mission.
This final pair just further shows how your main mother-ship is significantly too similar to mine. To be completely honest, I expect anyone who sees the thread of your mission, and the YouTube video of my mission to mistake them as the exact same mission.
While I feel I could have ripped this mission apart on your mission thread, I won't, because I feel this instance is best used as a learning opportunity. Missions are difficult to build, they often require extensive amounts of planning, testing, and whatnot to make everything work. Having someone copy your mission almost part-for-part can feel like you've been cheated in a way, especially if it's submitted to a challenge. It feels like plagiarism. My advice to you is to be inspired by missions like mine, or missions done by everyone else, but not to copy them in such a precise degree ever again. The reason I say that is 1. People might not take your missions seriously if they are mostly other people's designs, and 2. They might not be as polite as I am and go off on you.
At the end of the day, you did the Jool 5 mission, you planet the flags, and returned the Kerbals, although I'm just not sure what to do. I have never seen anything quite like this, with two virtually identical submissions from separate users. In a situation like this I would let the other mission's submitter determine if yours is counted or not, but that other submitter is me, so there is extreme bias present. So, I'm going to ask @Ziv and @sdj64, the previous heads of the Jool 5 Challenge decide for me. If they don't see this and reply, I'll determine another course of action I feel is fair to decide.