The glider "side-tracking" mechanism from Life doesn't seem to work for placing gliders on perpendicular tracks arbitrarily far away from the replicator -- the kickback reactions I know of move the track of the kicked glider inwards, towards the source of the glider causing the kickback, rather than outwards as in life. Instead, Dean suggests pushing a block to the desired track then hitting it with two gliders to form a third sideways-going glider:
These reactions together with the glider kickbacks are sufficient to place gliders on arbitrary tracks, far away from the source of the gliders. It remains to be seen whether these gliders can all be synchronized in such a way that they put together a computer, but it seems likely that this should all work.
B35/S236 -- Cellular Automata -- D. Eppstein -- UCI Inf. & Comp. Sci.