:D
A proper interior :lol: They are all different to some degree as its open to the builder to finish to suit - I will see if I can dig out a picture of mine that looks very nice but is of little use as it positions you too high. Basically too much padding has been put into the seat pads.
I have an old HOT CAR mag report on a Malaga and the interior is made from vinyl pads inthe old perforated/ribbed material - popular in the Seventies. seems to be separate seats pads and a pad for the top of the transmission tunnel. Seats held in place by pop studs on the to the rear of the tub.
As for the sill finish - yours look exactly the same as mine - which appear to be glass fibre channels that have been painted in body colour.
Tyres - on 5.5 J I would go for a set of 185/70's - 205's are a bit OTT - having said that my V8 S1 had 205's all round on 7" rims and my B runs 225/60/14's back and 205/60/14's front which is completely OTT and proably fearful in the wet.

Cheers
Andrew