Having checked the kit parts, I've decided to replace a couple with aftermarket items, and have edited the header details accordingly.
The pitot tube, although reasonably accurate, is bound to be prone to breakage, being on the nose, and also, the sprue attachments could prove difficult to remove fully, without damage to the part.
The ejection seat (described below) is a basic representation of the later version of the Martin Baker Mk4, as fitted to later Mirage III models With some modifications and 'enhancements', it would be more suitable for use with the Italeri kit (ex ESCI), which will be built as an Argentinian aircraft from the Falklands war. As the Italeri seat is very basic, and nothing like a Mirage seat, it will be ditched, this seat used in its place, and a resin seat used for this build.
Pic 1. The kit pitot tube, to be replaced with a brass item from 'Master'.
Pics 2 to 4. If the kit instructions are followed, then the top sections of the seat will not align. The tabs on the side pieces are designed to fit into slots on the seat back, as shown in pic 3, which would result in their being far too low (pic 4), preventing the top cover with the face blind handles from fitting together, the gap being around 2 to 3 mm.
Pics 5 and 6. The tabs were removed, and the side pieces cemented directly to the seat back, aligning with the top cover. The parachute pack, and seat base / back pad were then fitted and cemented in place. The parachute pack (upper kit part) suffered from poor locating tabs contact, possibly due to being moved into the correct location, and needed to be carefully positioned and then cemented in stages.
Pic 7. What the MB Mk4 seat should look like for a Mirage IIIC from this period.
The assembled seat will be put aside for use with the Italeri kit, and will be enhanced at that time. Meanwhile, I'm looking at the various options for the resin seats, and will order the best representation, along with the brass pitot tube.