Didn't notice all 7 rounds have been uploaded already. Thought you would be posting them separately, so I didn't even bother to look for them.
I counted 16 Czechs, that would be quite a number but unfortunately I think there will be "only" around 10 or 11 Czech drafted. I have started making my own top 20 Czechs ranking for the 2018 draft that I will post on HFB soon and the best CZE prospects you didn't include that do appear in my ranking are Radim Salda, Karel Plasek and Daniel Kurovsky. All are in my top 15. While Kurovsky and to a lesser extent Plasek are longshots, I think Salda has pretty good chance of getting drafted.
On the other hand, Buchtela, Blumel, Svoboda and Klapka don't appear in my list at all. Buchtela may be a victim of no viewing, he didn't impress me much in last year's U18 and haven't seen him since then. Stats wise he had an ok season, although his lack of scoring in U20 league is concerning. Blumel is someone I considered for my list, but ultimately decided to not go with him, because considering his play-style, his scoring is underwhelming. He clearly has some skill, but 8+10 in 50 games in the USHL is not draft worthy at all. Maybe invite him to the NHL development camp or just keep an eye on him the next season, but I would not spend a draft pick on him just yet. Admitedlly, I haven't seen Svoboda nor Klapka play a single time, but I can't understand why they keep popping on some rankings from time to time. Klapka has intriguing size, but he spent the whole season in the Czech U18 league. You sure don't want to draft any player from that until they prove themselves on a bigger stage. He should be playing U20/Czech2 next season though, that will tell us more. Svoboda did play in the U20 league, but scoring below PPG usually means you are not an NHL prospect.
As for the rest, Zabransky and Kvasnica are too high, but we have already discussed those two before, so I am going to leave it like that.
And from a Boston fan's point of view, not a fan. Don't want Ginning and Buchtela, know next to nothing about Stastney and Hughes. Durzi would be a nice pick though.