I figure out something like this on block 3 of data but can not guess exactly the way, for example in the next one
00000000 00000004 00000008 00000044
00000002 00001801 00000005 00000014
00000000 0001C00A 00000005 00000014
00000550
there is fixed values only changes the 44 and the 550 and it match with vertex and ofset end in vertex block. Also I believe faces are stored in ib blocks but lenght didn´t match at all (at least with an standard f v1/vn1/vt1,v2/vn2/vt2,v3/vn3/vt3
Thanks for your answer
