Yea my manifold has aluminium towers but getting some fab'd and welded could turn out to be expensive so probably get a quote first. On my Lynx Manifold, that one ( the thread i posted on the first page) had the steel rose joints and are higher than the plastic ones and have more adjustment.
Good linkages are essential to tuning as if one carb is activated just a little before the others it can throw the whole lot out.