LineSource can you help

Hi Line Source
Can you help me.
I want to build a 3 way speaker with SBA drivers, so thats its not too big I want to use the SB23NRXS45-8 as the bass unit with a suitable SBA mid and HF unit.
I want to build it as a bass reflex of about 40 to 45 litres and it will be close to the back wall so do not need too much baffle step as per Troels Grvesen designs.
I want to make it 10.5 inches wide and I dont want a slanted or stepped baffle like TG designs.
The width and flat baffle are for for WAF.
Can you help with a crossover design.
 
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