If u like those designs from Cellini, Can customize the Sofa using high resilient (HR) foam with covered ACASIA fabric + Polyester Cushions, with modern design at many factories in Sg Buloh, cost is around 5 - 6k for 9 x 9 feet. Considered cheap if compare with retail shops.

Haha bro, as I remember your residential is still under construction, so fast wanna survey Sofa already? Yeah Cellini is the modern designs which I usually like, their show rooms at MV / The Garden is usually expensive and costs around 8 - 12k for a decent one. The one I engaged (3 years back) served as distributor to Cellini, his factory is in Sg Buloh, 40% focus in domestic market and 60% exporting it outside of Malaysia - specialized in ACASIA fabrics. Knowing the young boss, he did gave me excellent services at reasonable price + some freebies, and came to my house to advise and customize in fitting it with TV console. I do think the foams is quite important, as it defines how long a sofa will lasts. It ranged from Normal foam (1-2 years) --> High Density (3-6 years) --> High Resilient (7-10 years). If I remember correctly, it is given 10 years warranty for the HR foam. After few years for now, god bless it has no issue. Specially attach the real pic for your reference bro, it is 9 ft x 9 ft. 

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No prob bro - wow you will be quite busy for the next 3 years then. it will be a memorable experience though if u catch chance to hands on with it. Since u r planning to rent it out, no need to engage those ID designers but try to add value / design everything by yourself as start. Engage the contractors separately, by purpose, and that would save u a lot. To satisfy the demand of rental market, today basic reno can be done with fully furnished at below 15k if you control the budget well. Have seen ppl who install the lights and fans by themselves, IMO this is good exercise but may not cost effective as we can get the electrical guy to install perfectly for us @ Rm 10 per light point, RM 15 per fan, and RM 60 per loop. I do however recommend to have basic reno to increase the value and proposition to rent. Plaster ceiling @ <2k is already sufficient to cover < 1000 sq ft unit and if can, invest @ 1k for Wallpapers. Good down lights (from Korea) is @ RM 45 each, use 4' inches (but higher lumen) and it will look more elegant. Have more strategies when your unit is ready, u may ping me at that time, will share how all these can be done at cheap costs but looks presentable. Good that your unit already has AC (check if dev giving inverter piping which is thicker) and kitchen cabinet (just hope they don't cut costs by giving the solid surface). 

All your questions can be concluded as good to have, and already budgeted under RM 15k. A unit with basic reno (than bare unit) able to fetch higher rental amounts. KL tenants are smart & choosy nowadays, they know how to choose for stay by comparing price versus what were furnished. Last time, without reno (just basic furniture) i rent out for RM 1100, after 2 years i put in 2k to do plaster ceiling with cheap T5 lighting washing the sideways of the walls. And invest RM 750 to put up wallpapers for 3 rooms, and Rm 1,500 for customized wardrobe / room. Now it can rent out easily with RM 500 per room and RM 600 for master room, which increased the returns from RM 1100 to RM 1600. Then i replicate the same settings to other units, consistently. Yeah for my case I bought everything and put in the store room and just pay labor fees for installation activities, hence the bills is usually transparent and can be itemized.