used haki a few times very similar and looks the biz,
timthumb, next time you use it with a crane, use the longest chains you can, we had a 26m span, got the two chains to about 4m from each end then use a ratchet strap to take the p!ss out of the apex (stops it bending and snaking) fix into position, we also built the peak to take the first row, do the same with next row and install ALL of the bracing and cross beams, leave the crane and straps in position, it stops it deflecting till you get it all wrapped up, do the next row in the same manner with cross beams and crane and continue, we got 12 rows in, in a shift (4 lads).
safety man was also there (first time we did it with the crane and MS was trial and error) and was over the moon with the technique,
still fukcing leaked a bit like.