I have inherited a small terrace house and want to get maximum space, therefore i have 4 entrances to make into sliding doors. Is your system okay for this use and do they come with pelmets to hide the top of the door runners?

The Rollan 40 sliding door gear would be ideal for your doors, as long as they are under 40kgs in weight.  (Otherwise go up to Rollan 80.)  There is no pelmet system which is designed for use with the Rollans, but it may be possible to make some yourself with wood.  The Perlan 140 has an optional extra pelmet called a clip cover, but the Perlan is for much heavier doors and together the price is higher.  You can view those products as well as the prices on our website at the links in the text.