Make sense its not going to move or start, as it is, w/o the originals assets it hard to find the exact again, even if, how many will mind some degree of difference ?
Then there the time involved, I'm not sure how much difference is using original assets vs created ones but its still mostly on the skills then involvement of the dev, if team its mostly of the leader as giving directions.
Then skills side its varied with code(s ?), render creation then export.
By now they are tutorials and collaboration areas, here is one quite correct in case.
To conclude, finding information isn't a common skill, add parts aren't readilily available.
TBS, hope the game get continued or restated as it was quite a nice setup (even if one more daughter?, coming home later on because of school/something else ?
Ho, Log Horizon season 2 is Ongoing !