I've been learning to do Megaminx bld. Memo was no problem in principle, I just
reused my Multi memo path and used a whole letter pair for each P / A / O.
The commutatotors for corners were easy, but it took a while to understand the
edge comms. Thanks Matthew

. Then I had to rethink the handling for buffer
pieces orientation, it also took a while. But now I think this is doable (for me)
First try (3 Dec), 13E and 10C off. Time 1:10.00, memo 40:55, it was real hard memo (I think)
because of five edge and four corner cycles and also both flipped and twisted single
pieces. I spent more than ten minutes just checking that I had all the pieces in memo.
(I am not used to look for that many pieces all over, even with 7x7 bld you never have
more than 24 places to look). The counting for big bld does not apply

.
Edit: One attempt each on the following two days (4&5 Dec), both bad (1:01:02 and 1:01:15)

I will not give up yet.
Edit 2: 6 Dec another bad one. Memo took over an hour because I had thought wrongly about where
the slave buffer piece would end up, I thought it was twisted and rememoed and rememoed but
came to the same ending every time. Total time 1:22:55, solving time ca 21 minutes.
Edit 3: 7 Dec. Some sort of progress. 22 edges and 10 corners solved, did not lose orientation. 59:14.
Edit 4: 8 Dec. 50:11 / 27:30 but totally messed up.
Edit 5: 10 Dec. Tenth attempt. Scrambled, lost ori. Times getting better 39:30 / 18:55.
Best so far is 25E+12C.